$CHRD
Chord Energy Corp Stock $chrd

$chrd Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000148615921000017 Filed on March 08, 2021

Income Statement

Concept	2020 Q4	2019 Q4	2019
Revenue	$107.0M	$483.9M	$1.931B
YoY Change	-77.89%	-19.32%	-16.85%
Cost Of Revenue	$88.90M	$178.0M	$836.1M
YoY Change	-50.06%	-66.78%	-12.46%
Gross Profit	$169.2M	$305.9M	$1.236B
YoY Change	-44.69%	-3.53%	-9.6%
Gross Profit Margin	158.14%	63.22%	64.0%
Selling, General & Admin	$63.10M	$58.00M	$272.3M
YoY Change	8.79%	-7.94%	19.15%
% of Gross Profit	37.29%	18.96%	22.04%
Research & Development	-$300.0K	$4.300M	$6.658M
YoY Change	-106.98%	16.22%	-75.73%
% of Gross Profit	-0.18%	1.41%	0.54%
Depreciation & Amortization	$16.09M	$209.2M	$787.2M
YoY Change	-92.31%	22.7%	23.71%
% of Gross Profit	9.51%	68.39%	63.71%
Operating Expenses	$97.20M	$271.4M	$1.066B
YoY Change	-64.19%	14.47%	19.49%
Operating Profit	$16.48M	$23.97M	-$90.18M
YoY Change	-31.23%	-65.59%	-175.77%
Interest Expense	$2.020M	-$116.0M	$159.3M
YoY Change	-101.74%	-151.12%	0.13%
% of Operating Profit	12.26%	-484.02%
Other Income/Expense, Net	-$87.04M	-$300.0K	-$260.7M
YoY Change	28912.0%		80.61%
Pretax Income	-$70.56M	-$88.00M	-$350.9M
YoY Change	-19.82%	-129.69%	1284.58%
Income Tax	-$3.447M	-$23.90M	-$32.72M
% Of Pretax Income
Net Earnings	-$49.91M	-$76.41M	-$128.2M
YoY Change	-34.68%	-134.42%	263.34%
Net Earnings / Revenue	-46.65%	-15.79%	-6.64%
Basic Earnings Per Share	-$2.50	-$0.24	-$0.41
Diluted Earnings Per Share	-$2.50	-$0.24	-$0.41
COMMON SHARES
Basic Shares Outstanding	19.99M shares	321.3M shares	315.0M shares
Diluted Shares Outstanding	19.99M shares		315.0M shares

Balance Sheet

Concept	2020 Q4	2019 Q4	2019
SHORT-TERM ASSETS
Cash & Short-Term Investments	$15.90M	$20.00M	$20.02M
YoY Change	-20.5%	-9.91%	-9.78%
Cash & Equivalents	$10.71M	$20.02M	$20.02M
Short-Term Investments
Other Short-Term Assets	$104.0K	$346.0K	$10.89M
YoY Change	-69.94%	89.07%	-90.21%
Inventory	$21.62M	$35.26M	$35.26M
Prepaid Expenses	$3.760M	$10.01M
Receivables	$234.4M	$371.2M	$371.2M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$339.1M	$437.4M	$437.4M
YoY Change	-22.47%	-21.08%	-21.08%
LONG-TERM ASSETS
Property, Plant & Equipment	$847.8M	$6.978B	$7.003B
YoY Change	-87.85%	-0.7%	-0.35%
Goodwill	$70.53M	$0.00
YoY Change
Intangibles	$43.67M	$0.00
YoY Change		-100.0%
Long-Term Investments
YoY Change
Other Assets	$18.75M	$29.44M	$59.33M
YoY Change	-36.29%	14.67%	32.19%
Total Long-Term Assets	$1.899B	$7.062B	$7.062B
YoY Change	-73.11%	-0.14%	-0.14%
TOTAL ASSETS
Total Short-Term Assets	$339.1M	$437.4M	$437.4M
Total Long-Term Assets	$1.899B	$7.062B	$7.062B
Total Assets	$2.238B	$7.499B	$7.499B
YoY Change	-70.16%	-1.66%	-1.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$21.52M	$17.95M	$17.95M
YoY Change	19.89%	-11.0%	-11.0%
Accrued Expenses	$108.1M	$281.1M	$324.6M
YoY Change	-61.53%	-15.25%	-12.18%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$2.413M
YoY Change
Total Short-Term Liabilities	$305.6M	$602.9M	$602.9M
YoY Change	-49.31%	-1.45%	-1.45%
LONG-TERM LIABILITIES
Long-Term Debt	$340.0M	$2.712B	$2.716B
YoY Change	-87.46%	-0.87%	-0.72%
Other Long-Term Liabilities	$3.504M	$6.019M	$76.40M
YoY Change	-41.78%	-22.35%	27.01%
Total Long-Term Liabilities	$343.5M	$2.718B	$2.792B
YoY Change	-87.36%	-0.93%	-0.13%
TOTAL LIABILITIES
Total Short-Term Liabilities	$305.6M	$602.9M	$602.9M
Total Long-Term Liabilities	$343.5M	$2.718B	$2.792B
Total Liabilities	$1.180B	$3.662B	$3.863B
YoY Change	-67.79%	-1.22%	-0.73%
SHAREHOLDERS EQUITY
Retained Earnings	$0.00	$554.4M
YoY Change	-100.0%	-18.78%
Common Stock	$965.9M	$3.116B
YoY Change	-69.0%	1.13%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$0.00	$33.88M
YoY Change	-100.0%	16.73%
Treasury Stock Shares	0.000 shares	2.967M shares
Shareholders Equity	$965.6M	$3.636B	$3.636B
YoY Change
Total Liabilities & Shareholders Equity	$2.238B	$7.499B	$7.499B
YoY Change	-70.16%	-1.66%	-1.66%

Cashflow Statement

Concept	2020 Q4	2019 Q4	2019
OPERATING ACTIVITIES
Net Income	-$49.91M	-$76.41M	-$128.2M
YoY Change	-34.68%	-134.42%	263.34%
Depreciation, Depletion And Amortization	$16.09M	$209.2M	$787.2M
YoY Change	-92.31%	22.7%	23.71%
Cash From Operating Activities	$95.26M	$253.0M	$892.9M
YoY Change	-62.35%	7.94%	-10.39%
INVESTING ACTIVITIES
Capital Expenditures	$50.00M	$167.6M	-$890.2M
YoY Change	-70.17%	-45.87%	-48.56%
Acquisitions	$0.00		$21.01M
YoY Change			-96.39%
Other Investing Activities	$0.00	$9.700M	$0.00
YoY Change	-100.0%	-119.32%	-100.0%
Cash From Investing Activities	-$9.881M	-$158.0M	-$828.8M
YoY Change	-93.75%	-56.09%	-48.64%
FINANCING ACTIVITIES
Cash Dividend Paid	$0.00		$0.00
YoY Change
Common Stock Issuance & Retirement, Net	$0.00		$0.00
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$85.70M	-94.50M	-$66.27M
YoY Change	-9.31%	-172.3%	-110.64%
NET CHANGE
Cash From Operating Activities	$95.26M	253.0M	$892.9M
Cash From Investing Activities	-$9.881M	-158.0M	-$828.8M
Cash From Financing Activities	-$85.70M	-94.50M	-$66.27M
Net Change In Cash	-$328.0K	500.0K	-$2.171M
YoY Change	-165.6%	-90.57%	-139.69%
FREE CASH FLOW
Cash From Operating Activities	$95.26M	$253.0M	$892.9M
Capital Expenditures	$50.00M	$167.6M	-$890.2M
Free Cash Flow	$45.26M	$85.40M	$1.783B
YoY Change	-47.01%	-213.56%	-34.61%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001486159
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P1Y
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-34776
CY2020	dei	Entity Registrant Name EntityRegistrantName	Oasis Petroleum Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	80-0554627
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1001 Fannin Street
CY2020	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 1500
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Houston
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	TX
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	77002
CY2020	dei	City Area Code CityAreaCode	281
CY2020	dei	Local Phone Number LocalPhoneNumber	404-9500
CY2020	dei	Security12b Title Security12bTitle	Common Stock
CY2020	dei	Trading Symbol TradingSymbol	OAS
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020	dei	Entity Bankruptcy Proceedings Reporting Current EntityBankruptcyProceedingsReportingCurrent	true
CY2020Q2	dei	Entity Public Float EntityPublicFloat	236577404	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	20093083	shares
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15856000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20019000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	4370000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	206539000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	371181000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	33929000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	35259000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	9729000	USD
CY2019Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	10011000	USD
CY2020Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	467000	USD
CY2019Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	535000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	727000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	346000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	271617000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	437351000	USD
CY2020Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	810328000	USD
CY2019Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	9463038000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	935950000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1279653000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	17491000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	3764915000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1728787000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6977776000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	5500000	USD
CY2019Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	21628000	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2019Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	639000	USD
CY2020Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	14522000	USD
CY2019Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	13924000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6083000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	18497000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	43667000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	70534000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	0	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	18327000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	29438000	USD
CY2020Q4	us-gaap	Assets Assets	2159037000	USD
CY2019Q4	us-gaap	Assets Assets	7499253000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	3242000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	17948000	USD
CY2020Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	146497000	USD
CY2019Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	233090000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	126284000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	281079000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	980000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	37388000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	56944000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	19695000	USD
CY2020Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	2723000	USD
CY2019Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	4598000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2607000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6182000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1954000	USD
CY2019Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	2903000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	341231000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	602883000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	710000000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2711573000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	984000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	267357000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	46363000	USD
CY2019Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	56305000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	37614000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	120000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	2362000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	17915000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	7744000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	6019000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1146298000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	3662172000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	900000000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	324198057	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	321231319	shares
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	3189000	USD
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	2966738	shares
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	33881000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	20093017	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	20093017	shares
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	200000	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	965654000	USD
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3112384000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-49912000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	554446000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	915942000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	3636138000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	96797000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	200943000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1012739000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3837081000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2159037000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7499253000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	119915000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	963419000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2071744000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2321947000	USD
CY2020Q4	us-gaap	Operating Lease Expense OperatingLeaseExpense	17841000	USD
	us-gaap	Operating Lease Expense OperatingLeaseExpense	118372000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	223384000	USD
CY2018	us-gaap	Operating Lease Expense OperatingLeaseExpense	193912000	USD
CY2020Q4	us-gaap	Results Of Operations Transportation Costs ResultsOfOperationsTransportationCosts	9124000	USD
	us-gaap	Results Of Operations Transportation Costs ResultsOfOperationsTransportationCosts	85896000	USD
CY2019	us-gaap	Results Of Operations Transportation Costs ResultsOfOperationsTransportationCosts	128806000	USD
CY2018	us-gaap	Results Of Operations Transportation Costs ResultsOfOperationsTransportationCosts	107193000	USD
CY2020Q4	us-gaap	Production Tax Expense ProductionTaxExpense	5938000	USD
	us-gaap	Production Tax Expense ProductionTaxExpense	45439000	USD
CY2019	us-gaap	Production Tax Expense ProductionTaxExpense	112592000	USD
CY2018	us-gaap	Production Tax Expense ProductionTaxExpense	133696000	USD
CY2020Q4	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16094000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	291115000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	787192000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	636296000	USD
CY2020Q4	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	4937143000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	10257000	USD
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	384228000	USD
CY2020Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	14224000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	145294000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	123506000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	121346000	USD
CY2020Q4	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	-22750000	USD
CY2019	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	-20000000	USD
CY2018	us-gaap	Gain Loss Related To Litigation Settlement GainLossRelatedToLitigationSettlement	0	USD
CY2020Q4	us-gaap	Costs And Expenses CostsAndExpenses	81150000	USD
	us-gaap	Costs And Expenses CostsAndExpenses	5885574000	USD
CY2019	us-gaap	Costs And Expenses CostsAndExpenses	1912866000	USD
CY2018	us-gaap	Costs And Expenses CostsAndExpenses	2231522000	USD
CY2020Q4	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	11000	USD
	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	10396000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-4455000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	28587000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	38776000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	-4911759000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	154423000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	119012000	USD
CY2020Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-84615000	USD
CY2020Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-84615000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	233565000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-106314000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	28457000	USD
CY2020Q4	us-gaap	Interest Expense InterestExpense	3168000	USD
	us-gaap	Interest Expense InterestExpense	181484000	USD
CY2019	us-gaap	Interest Expense InterestExpense	176223000	USD
CY2018	us-gaap	Interest Expense InterestExpense	159085000	USD
CY2020Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	83867000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	4312000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-13848000	USD
CY2020Q4	oas	Reorganization Items Net ReorganizationItemsNet	0	USD
	oas	Reorganization Items Net ReorganizationItemsNet	786831000	USD
CY2019	oas	Reorganization Items Net ReorganizationItemsNet	0	USD
CY2018	oas	Reorganization Items Net ReorganizationItemsNet	0	USD
CY2020Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-402000	USD
	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1407000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	440000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	121000	USD
CY2020Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-88185000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	924186000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-277785000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-144355000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-49409000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-3987573000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-123362000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-25343000	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3447000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-262962000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-32715000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5843000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	-45962000	USD
	us-gaap	Profit Loss ProfitLoss	-3724611000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-90647000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-90647000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-19500000	USD
CY2020Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3950000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-84283000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	37596000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	15796000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-49912000	USD
	us-gaap	Net Income Loss NetIncomeLoss	-3640328000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-128243000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-35296000	USD
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.50
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-11.46
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.41
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.11
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.50
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-11.46
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.41
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.11
CY2020Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19991000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	317644000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	315002000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	307480000	shares
CY2020Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19991000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	317644000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	315002000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	307480000	shares
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3513579000	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	371220000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	31044000	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	44503000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	14114000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	6846000	USD
CY2018	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	1006000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-19500000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3918880000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	35392000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	21270000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	4856000	USD
CY2019	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	418000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-90647000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3837081000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	31734000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	24080000	USD
	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	-337000	USD
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2756000	USD
	us-gaap	Profit Loss ProfitLoss	-3724611000	USD
	oas	Cancellation Of Predecessor Equity CancellationOfPredecessorEquity	23805000	USD
	oas	Issuance Of Successor Common Stock IssuanceOfSuccessorCommonStock	941810000	USD
	oas	Issuance Of Successor Warrants Net Of Offering Costs IssuanceOfSuccessorWarrantsNetOfOfferingCosts	23805000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1058431000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1058431000	USD
CY2020Q4	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	270000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	-45962000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1012739000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	-45962000	USD
	us-gaap	Profit Loss ProfitLoss	-3724611000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	-90647000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	-19500000	USD
CY2020Q4	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16094000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	291115000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	787192000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	636296000	USD
CY2020Q4	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	83867000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	4312000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-13848000	USD
CY2020Q4	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	11000	USD
	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	10396000	USD
CY2019	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-4455000	USD
CY2018	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	28587000	USD
CY2020Q4	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	4937143000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	10257000	USD
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	384228000	USD
CY2020Q4	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3447000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-262926000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-32699000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5866000	USD
CY2020Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-84615000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	233565000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-106314000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	28457000	USD
CY2020Q4	us-gaap	Share Based Compensation ShareBasedCompensation	270000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	31315000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	33607000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	29273000	USD
CY2020Q4	oas	Non Cash Reorganization Items Net NonCashReorganizationItemsNet	0	USD
	oas	Non Cash Reorganization Items Net NonCashReorganizationItemsNet	-809036000	USD
CY2019	oas	Non Cash Reorganization Items Net NonCashReorganizationItemsNet	0	USD
CY2018	oas	Non Cash Reorganization Items Net NonCashReorganizationItemsNet	0	USD
CY2020Q4	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	6824000	USD
	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	41811000	USD
CY2019	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	27263000	USD
CY2018	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	29057000	USD
CY2020Q4	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-68322000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-96436000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-13729000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	23508000	USD
CY2020Q4	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1902000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4005000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	5893000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	14346000	USD
CY2020Q4	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	2976000	USD
	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-1674000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-325000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	2354000	USD
CY2020Q4	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-24573000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-62694000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	53051000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	26116000	USD
CY2020Q4	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	5803000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	5458000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	9789000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-221000	USD
CY2020Q4	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	95255000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	202936000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	892853000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	996421000	USD
CY2020Q4	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	9805000	USD
	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	332007000	USD
CY2019	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	869221000	USD
CY2018	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	1148961000	USD
CY2020Q4	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	21009000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	581650000	USD
CY2020Q4	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	0	USD
	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	15188000	USD
CY2019	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	42376000	USD
CY2018	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	333229000	USD
CY2020Q4	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	0	USD
	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	0	USD
CY2019	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	0	USD
CY2018	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	2850000	USD
CY2020Q4	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	76000	USD
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-224416000	USD
CY2019	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-19098000	USD
CY2018	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	213528000	USD
CY2020Q4	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-224000	USD
CY2020Q4	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9881000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-92403000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-828756000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1613536000	USD
CY2020Q4	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	29000000	USD
	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	686189000	USD
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1982000000	USD
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	3224000000	USD
CY2020Q4	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	114500000	USD
	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	686189000	USD
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1972500000	USD
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	2586000000	USD
CY2020Q4	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	68060000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	45790000	USD
CY2018	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	423340000	USD
CY2020Q4	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	400000000	USD
CY2020Q4	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	7260000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1052000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	13862000	USD
CY2020Q4	oas	Payments Of Debtor In Possession Credit Facility Fees PaymentsOfDebtorInPossessionCreditFacilityFees	0	USD
	oas	Payments Of Debtor In Possession Credit Facility Fees PaymentsOfDebtorInPossessionCreditFacilityFees	5853000	USD
CY2019	oas	Payments Of Debtor In Possession Credit Facility Fees PaymentsOfDebtorInPossessionCreditFacilityFees	0	USD
CY2018	oas	Payments Of Debtor In Possession Credit Facility Fees PaymentsOfDebtorInPossessionCreditFacilityFees	0	USD
CY2020Q4	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	44503000	USD
CY2020Q4	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	0	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2756000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	4856000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6846000	USD
CY2020Q4	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	24080000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	21270000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	14114000	USD
CY2020Q4	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	202000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1989000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2382000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2020Q4	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-418000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1756000	USD
CY2020Q4	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-85702000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-109998000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-66268000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	622585000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-328000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	535000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-2171000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	5470000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20554000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20019000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	146000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22190000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	16720000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20226000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20554000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20019000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	22190000	USD
CY2020Q4	us-gaap	Interest Paid Net InterestPaidNet	2411000	USD
	us-gaap	Interest Paid Net InterestPaidNet	152416000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	155833000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	141196000	USD
CY2020Q4	us-gaap	Income Taxes Paid IncomeTaxesPaid	1000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	109000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	111000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	38000	USD
CY2020Q4	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	28000	USD
	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	282000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	25000	USD
CY2020Q4	oas	Reorganization Items Paid ReorganizationItemsPaid	0	USD
	oas	Reorganization Items Paid ReorganizationItemsPaid	22205000	USD
CY2019	oas	Reorganization Items Paid ReorganizationItemsPaid	0	USD
CY2018	oas	Reorganization Items Paid ReorganizationItemsPaid	0	USD
CY2020Q4	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	7938000	USD
	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-107725000	USD
CY2019	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-82414000	USD
CY2018	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	68946000	USD
CY2020Q4	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	377000	USD
	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	-10268000	USD
CY2019	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	4917000	USD
CY2018	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	3880000	USD
CY2020Q4	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2019	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	0	USD
CY2018	us-gaap	Business Combination Consideration Transferred Equity Interests Issued And Issuable BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	371220000	USD
CY2020Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	94.57
CY2020Q4	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	15600000	USD
CY2020Q4	oas	Reorganization Value Percentage Of Voting Interest Received ReorganizationValuePercentageOfVotingInterestReceived	0.50
CY2020Q4	oas	Reorganization Value Related To Successor Assets ReorganizationValueRelatedToSuccessorAssets	2200000000	USD
CY2020Q4	oas	Reorganization Value Post Petition Liabilities And Allowed Claims ReorganizationValuePostPetitionLiabilitiesAndAllowedClaims	3200000000	USD
CY2020Q4	us-gaap	Reorganization Value ReorganizationValue	1300000000	USD
CY2020Q4	us-gaap	Reorganization Value ReorganizationValue	1300000000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Cash And Cash Equivalents FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents	5615000	USD
CY2020Q4	oas	Fresh Start Adjustment Increase Decrease Implied Value FreshStartAdjustmentIncreaseDecreaseImpliedValue	965615000	USD
CY2020Q4	oas	Fresh Start Adjustment Increase Decrease Fair Value Of Non Controlling Interest FreshStartAdjustmentIncreaseDecreaseFairValueOfNonControllingInterest	92816000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Stockholders Equity FreshStartAdjustmentIncreaseDecreaseStockholdersEquity	1058431000	USD
	oas	Reorganization Value Restricted Cash Attributable To Related Party ReorganizationValueRestrictedCashAttributableToRelatedParty	4500000	USD
CY2020Q4	oas	Reorganization Value Restricted Cash ReorganizationValueRestrictedCash	1400000	USD
	oas	Reorganization Value Restricted Cash Related To Professional Fees ReorganizationValueRestrictedCashRelatedToProfessionalFees	10400000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod	20000000	shares
CY2020Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	1621622	shares
CY2020Q4	us-gaap	Reorganization Value ReorganizationValue	1300000000	USD
CY2020Q4	oas	Fresh Start Adjustment Increase Decrease Fair Value Of Non Controlling Interest FreshStartAdjustmentIncreaseDecreaseFairValueOfNonControllingInterest	92816000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Cash And Cash Equivalents FreshStartAdjustmentIncreaseDecreaseCashAndCashEquivalents	5615000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Other Current Liabilities FreshStartAdjustmentIncreaseDecreaseOtherCurrentLiabilities	305592000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Other Current Liabilities FreshStartAdjustmentIncreaseDecreaseOtherCurrentLiabilities	305592000	USD
CY2020Q4	oas	Fresh Start Adjustment Increase Decrease Asset Retirement Obligations FreshStartAdjustmentIncreaseDecreaseAssetRetirementObligations	45986000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Other Noncurrent Obligations FreshStartAdjustmentIncreaseDecreaseOtherNoncurrentObligations	32482000	USD
CY2020Q4	oas	Reorganization Value Related To Successor Assets ReorganizationValueRelatedToSuccessorAssets	2237991000	USD
	oas	Reorganization Value Restricted Cash Attributable To Related Party ReorganizationValueRestrictedCashAttributableToRelatedParty	4500000	USD
CY2020Q4	oas	Reorganization Value Restricted Cash ReorganizationValueRestrictedCash	1400000	USD
	oas	Reorganization Value Restricted Cash Related To Professional Fees ReorganizationValueRestrictedCashRelatedToProfessionalFees	10400000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	74071000	USD
CY2020Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	795247000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8754000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	11800000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	274679000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	274679000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	33729000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	35831000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	10864000	USD
CY2020Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	6539000	USD
CY2020Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	728000	USD
CY2020Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	728000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	754000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	754000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	394825000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	339085000	USD
CY2020Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	9256532000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1311240000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	938172000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8579696000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	0	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1988076000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1733419000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	1380000	USD
CY2020Q4	us-gaap	Disposal Group Including Discontinued Operation Assets Noncurrent DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	5500000	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	47000	USD
CY2020Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	47000	USD
CY2020Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	14107000	USD
CY2020Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	14520000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	13260000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	12463000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	667000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	43667000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	70534000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	21393000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	18756000	USD
CY2020Q4	us-gaap	Assets Assets	2433755000	USD
CY2020Q4	us-gaap	Assets Assets	2237991000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	9206000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	31015000	USD
CY2020Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	130487000	USD
CY2020Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	130487000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	72513000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	131868000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	360640000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	60988000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	478000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4902000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	4969000	USD
CY2020Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	170000	USD
CY2020Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	2725000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1050000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	1898000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	412000	USD
CY2020Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	2152000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	640368000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	305592000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	455500000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	795500000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1097000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	4431000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2246000	USD
CY2020Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	45986000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	5316000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	5357000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	914000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	15636000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	3634000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	7058000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	2051294000	USD
CY2020Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	0	USD
CY2020Q4	us-gaap	Liabilities Liabilities	3160369000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1179560000	USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	3233000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	200000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	36637000	USD
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	0	USD
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3131446000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	965415000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-3995209000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	0	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	-897167000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	965615000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	170553000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	92816000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-726614000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1058431000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2433755000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2237991000	USD
CY2020Q4	oas	Reorganization Value Payment Of Contract Cure ReorganizationValuePaymentOfContractCure	20000000	USD
CY2020Q4	oas	Reorganization Value Funding Of Professional Fee Escrow Account ReorganizationValueFundingOfProfessionalFeeEscrowAccount	11800000	USD
CY2020Q4	oas	Reorganization Value Payment Of Debt Issuance Costs Related To Exit Facility ReorganizationValuePaymentOfDebtIssuanceCostsRelatedToExitFacility	6900000	USD
CY2020Q4	oas	Reorganization Value Payment Of Professional Fees ReorganizationValuePaymentOfProfessionalFees	3766000	USD
CY2020Q4	oas	Reorganization Value Uses Of Cash ReorganizationValueUsesOfCash	65317000	USD
	oas	Reorganization Value Write Off Of Deferred Financing Costs ReorganizationValueWriteOffOfDeferredFinancingCosts	200000	USD
CY2020Q4	oas	Reorganization Value Liabilities Subject To Compromise Accounts Payable ReorganizationValueLiabilitiesSubjectToCompromiseAccountsPayable	19900000	USD
CY2020Q4	oas	Reorganization Value Reclassification Of Payable For Vested Awards ReorganizationValueReclassificationOfPayableForVestedAwards	1900000	USD
CY2020Q4	oas	Reorganization Value Reinstatement Of Accrued Expenses From Liabilities Subject To Compromise ReorganizationValueReinstatementOfAccruedExpensesFromLiabilitiesSubjectToCompromise	73778000	USD
CY2020Q4	oas	Reorganization Value Payment Of Professional Fees Upon Emergence ReorganizationValuePaymentOfProfessionalFeesUponEmergence	4603000	USD
CY2020Q4	oas	Reorganization Value Vesting Of Compensation Awards Classified As Liabilities ReorganizationValueVestingOfCompensationAwardsClassifiedAsLiabilities	1142000	USD
CY2020Q4	oas	Reorganization Value Payment Of Contract Cure ReorganizationValuePaymentOfContractCure	20000000	USD
CY2020Q4	oas	Reorganization Value Reclassification Of Payable For Vested Awards ReorganizationValueReclassificationOfPayableForVestedAwards	1913000	USD
CY2020Q4	oas	Reorganization Value Professional Fee Accrued ReorganizationValueProfessionalFeeAccrued	140000	USD
CY2020Q4	oas	Reorganization Value Increase Decrease In Accrued Liabilities Net ReorganizationValueIncreaseDecreaseInAccruedLiabilitiesNet	57470000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	28000000.0	USD
CY2020Q4	us-gaap	Debtor In Possession Financing Amount Arranged DebtorInPossessionFinancingAmountArranged	20600000	USD
CY2020Q4	oas	Reorganization Value Notes ReorganizationValueNotes	1825757000	USD
CY2020Q4	oas	Reorganization Value Accrued Interest On Notes ReorganizationValueAccruedInterestOnNotes	50337000	USD
CY2020Q4	oas	Reorganization Value Asset Retirement Obligation ReorganizationValueAssetRetirementObligation	57306000	USD
CY2020Q4	oas	Reorganization Value Accounts Payable And Accrued Liabilities ReorganizationValueAccountsPayableAndAccruedLiabilities	93674000	USD
CY2020Q4	oas	Reorganization Value Other Liabilities ReorganizationValueOtherLiabilities	24220000	USD
CY2020Q4	oas	Reorganization Value Liabilities Subject To Compromise ReorganizationValueLiabilitiesSubjectToCompromise	2051294000	USD
CY2020Q4	oas	Reorganization Value Reinstatement Of Liabilities Unsecured Claims ReorganizationValueReinstatementOfLiabilitiesUnsecuredClaims	175200000	USD
CY2020Q4	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	941810000	USD
CY2020Q4	oas	Reorganization Value Gain Loss On Settlements Of Liabilities Subject To Compromise ReorganizationValueGainLossOnSettlementsOfLiabilitiesSubjectToCompromise	934284000	USD
CY2020Q4	us-gaap	Fresh Start Adjustment Increase Decrease Retained Earnings Deficit FreshStartAdjustmentIncreaseDecreaseRetainedEarningsDeficit	-3086292000	USD
CY2020Q4	oas	Reorganization Value Common Stock Value Cancelled ReorganizationValueCommonStockValueCancelled	3233000	USD
CY2020Q4	oas	Reorganization Value Treasury Stock Value Cancelled ReorganizationValueTreasuryStockValueCancelled	36637000	USD
CY2020Q4	oas	Reorganization Value Compensation For Vesting Awards Equity ReorganizationValueCompensationForVestingAwardsEquity	12055000	USD
CY2020Q4	us-gaap	Adjustments To Additional Paid In Capital Warrant Issued AdjustmentsToAdditionalPaidInCapitalWarrantIssued	23805000	USD
CY2020Q4	oas	Reorganization Value Increase Decrease In Additional Paid In Capital ReorganizationValueIncreaseDecreaseInAdditionalPaidInCapital	-3131446000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod	20000000	shares
CY2020Q4	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	0.01
CY2020Q4	us-gaap	Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights	1621622	shares
CY2020Q4	oas	Reorganization Value Fair Value Method Exercise Price Of Warrants Or Rights ReorganizationValueFairValueMethodExercisePriceOfWarrantsOrRights	14.68
CY2020Q4	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	941810000	USD
CY2020Q4	us-gaap	Proceeds From Issuance Of Warrants ProceedsFromIssuanceOfWarrants	23805000	USD
CY2020Q4	us-gaap	Equity Fair Value Adjustment EquityFairValueAdjustment	965615000	USD
	oas	Reorganization Value Gain Loss On Settlements Of Liabilities Subject To Compromise ReorganizationValueGainLossOnSettlementsOfLiabilitiesSubjectToCompromise	934284000	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	28014000	USD
	oas	Reorganization Value Gain Loss On Debt Discharge ReorganizationValueGainLossOnDebtDischarge	992583000	USD
	oas	Reorganization Value Expenses Incurred Professional Fees ReorganizationValueExpensesIncurredProfessionalFees	7869000	USD
	oas	Reorganization Value Write Off Of Deferred Financing Costs ReorganizationValueWriteOffOfDeferredFinancingCosts	243000	USD
	oas	Reorganization Items From Reorganization Adjustments ReorganizationItemsFromReorganizationAdjustments	984471000	USD
	oas	Reorganization Value Equity Based Compensation Expense For Vesting Awards ReorganizationValueEquityBasedCompensationExpenseForVestingAwards	-13197000	USD
	oas	Reorganization Value Vesting Of Prepaid Cash Incentive Compensation ReorganizationValueVestingOfPrepaidCashIncentiveCompensation	-4325000	USD
	oas	Reorganization Value Net Income Loss From Reorganization Adjustments Before Income Taxes ReorganizationValueNetIncomeLossFromReorganizationAdjustmentsBeforeIncomeTaxes	966949000	USD
	oas	Reorganization Value Income Tax Expense ReorganizationValueIncomeTaxExpense	9746000	USD
	oas	Reorganization Value Net Income Loss From Reorganization Adjustments Including Noncontrolling Interest ReorganizationValueNetIncomeLossFromReorganizationAdjustmentsIncludingNoncontrollingInterest	957203000	USD
	oas	Reorganization Value Net Income Loss From Reorganization Adjustments Attributable To Noncontrolling Interest ReorganizationValueNetIncomeLossFromReorganizationAdjustmentsAttributableToNoncontrollingInterest	9094000	USD
	oas	Reorganization Value Net Income Loss From Reorganization Adjustments ReorganizationValueNetIncomeLossFromReorganizationAdjustments	948109000	USD
	oas	Reorganization Value Cancellation Of Accumulated Deficit ReorganizationValueCancellationOfAccumulatedDeficit	3086292000	USD
CY2020Q4	oas	Fresh Start Adjustments Deferred Financing Cost Adjustment Related To Infrastructure Costs FreshStartAdjustmentsDeferredFinancingCostAdjustmentRelatedToInfrastructureCosts	8100000	USD
CY2020Q4	oas	Fresh Start Adjustments Deferred Financing Costs Adjustment Related To Finance Lease Right Of Use Assets FreshStartAdjustmentsDeferredFinancingCostsAdjustmentRelatedToFinanceLeaseRightOfUseAssets	100000	USD
CY2020Q4	oas	Asset Retirement Obligations Fair Value Measurements Inflation Factor AssetRetirementObligationsFairValueMeasurementsInflationFactor	0.02
CY2020Q4	oas	Asset Retirement Obligations Fair Value Assumptions Risk Free Rate AssetRetirementObligationsFairValueAssumptionsRiskFreeRate	0.085
CY2020Q4	oas	Derivative Instrument Fair Value Measurements Risk Free Rate DerivativeInstrumentFairValueMeasurementsRiskFreeRate	0.0512
CY2020Q4	oas	Fresh Start Adjustment Galin Loss On Revaluation Adjustments FreshStartAdjustmentGalinLossOnRevaluationAdjustments	-132435000	USD
CY2020Q4	oas	Fresh Start Adjustment Income Tax Benefit Loss FreshStartAdjustmentIncomeTaxBenefitLoss	6412000	USD
CY2020Q4	oas	Fresh Start Adjustment Net Income Loss From Fresh Start Adjustments Including Noncontrolling Interest FreshStartAdjustmentNetIncomeLossFromFreshStartAdjustmentsIncludingNoncontrollingInterest	-126023000	USD
CY2020Q4	oas	Fresh Start Adjustment Net Income Loss From Fresh Start Adjusments Attributable To Noncontrolling Interest FreshStartAdjustmentNetIncomeLossFromFreshStartAdjusmentsAttributableToNoncontrollingInterest	86831000	USD
CY2020Q4	oas	Fresh Start Adjustment Net Income Loss FreshStartAdjustmentNetIncomeLoss	-39192000	USD
CY2020Q4	oas	Reorganization Value Gain Loss On Debt Discharge ReorganizationValueGainLossOnDebtDischarge	992583000	USD
CY2020Q4	oas	Fresh Start Adjustment Galin Loss On Revaluation Adjustments FreshStartAdjustmentGalinLossOnRevaluationAdjustments	-132435000	USD
CY2020Q4	oas	Reorganization Value Write Off Of Unamortized Debt Discount ReorganizationValueWriteOffOfUnamortizedDebtDiscount	38373000	USD
CY2020Q4	us-gaap	Debtor Reorganization Items Legal And Advisory Professional Fees DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	16352000	USD
CY2020Q4	oas	Reorganization Value Write Off Of Unamortized Deferred Financing Costs ReorganizationValueWriteOffOfUnamortizedDeferredFinancingCosts	12739000	USD
CY2020Q4	oas	Reorganization Value Dip Credit Facility Fees ReorganizationValueDIPCreditFacilityFees	5853000	USD
CY2020Q4	us-gaap	Reorganization Items ReorganizationItems	786831000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Preparation of the Company’s consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. The most significant estimates pertain to proved crude oil and natural gas reserves and related cash flow estimates used in impairment tests of long-lived assets, estimates of future development, dismantlement and abandonment costs, estimates relating to certain crude oil and natural gas revenues and expenses and estimates of expenses related to legal, environmental and other contingencies. Certain of these estimates require assumptions regarding future commodity prices, future costs and expenses and future production rates. Actual results could differ from those estimates.</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Estimates of crude oil and natural gas reserves and their values, future production rates and future costs and expenses are inherently uncertain for numerous reasons, including many factors beyond the Company’s control. Reservoir engineering is a </span></div>subjective process of estimating underground accumulations of crude oil and natural gas that cannot be measured in an exact manner. The accuracy of any reserve estimate is a function of the quality of data available and of engineering and geological interpretation and judgment. In addition, estimates of reserves may be revised based on actual production, results of subsequent exploration and development activities, prevailing commodity prices, operating costs and other factors. These revisions may be material and could materially affect future depreciation, depletion and amortization (“DD&A”) expense, dismantlement and abandonment costs, and impairment expense.
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	15856000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	8754000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	20019000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	4370000	USD
CY2020Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	11800000	USD
CY2019Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	0	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20226000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20554000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	20019000	USD
CY2020Q4	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	100000	USD
	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	6400000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	12000000.0	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	17200000	USD
CY2020Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2019Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2018Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	4457000	USD
CY2017Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2020Q4	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	0	USD
	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	0	USD
CY2019	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	0	USD
CY2018	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	26497000	USD
CY2020Q4	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	0	USD
	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	0	USD
CY2019	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	4222000	USD
CY2018	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	22040000	USD
CY2020Q4	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	0	USD
	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	0	USD
CY2019	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	235000	USD
CY2018	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	0	USD
CY2020Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2020Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2019Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2018Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	4457000	USD
CY2020Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0	USD
CY2020Q4	oas	Inventory Noncurrent Linefill InventoryNoncurrentLinefill	14522000	USD
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-top:10pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Concentrations of Market and Credit Risk</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The future results of the Company’s crude oil and natural gas operations will be affected by the market prices of crude oil and natural gas. The availability of a ready market for crude oil and natural gas products in the future will depend on numerous factors beyond the control of the Company, including weather, imports, marketing of competitive fuels, proximity and capacity of crude oil and natural gas pipelines and other transportation facilities, any oversupply or undersupply of crude oil, natural gas and liquid products, the regulatory environment, the economic environment, and other regional and political events, none of which can be predicted with certainty. Commodity prices have been volatile in recent years. Due to a combination of the impacts of the COVID-19 pandemic and geopolitical pressures on the global supply and demand balance for crude oil and related products, commodity prices sharply declined in the first half of 2020, which adversely affected the Company’s business, operating results and liquidity. A substantial or extended decline in the price of crude oil could have a further material adverse effect on the Company’s financial position, cash flows and results of operations.</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company’s receivables include amounts due from purchasers of its crude oil and natural gas production and amounts due from joint interest partners for their respective portions of operating expenses and exploration and development costs. While certain of these customers and joint interest partners are affected by periodic downturns in the economy in general or in their specific segment of the crude oil or natural gas industry, including the current commodity price environment, the Company believes that its level of credit-related losses due to such economic fluctuations has been and will continue to be immaterial to the Company’s results of operations over the long-term. </span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company manages and controls market and counterparty credit risk. In the normal course of business, collateral is not required for financial instruments with credit risk. Financial instruments which potentially subject the Company to credit risk consist principally of temporary cash balances and derivative financial instruments. The Company maintains cash and cash equivalents in bank deposit accounts which, at times, may exceed the federally insured limits. The Company has not experienced any significant losses from such investments. The Company attempts to limit the amount of credit exposure to any one financial institution or company. The Company believes the credit quality of its customers is generally high. In the normal course of business, letters of credit or parent guarantees are required for counterparties which management perceives to have a higher credit risk.</span></div>
CY2020Q4	oas	Derivative Numberof Counterparties DerivativeNumberofCounterparties	8	counterparty
CY2020Q4	oas	Derivative Instrument Receivables From Counterparty Past Due DerivativeInstrumentReceivablesFromCounterpartyPastDue	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	2105000	USD
CY2018Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	0	USD
CY2020Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	8826000	USD
CY2019Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	18296000	USD
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	25103000	USD
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	16963000	USD
CY2020Q4	us-gaap	Inventory Net InventoryNet	33929000	USD
CY2020	oas	Contract With Customer Liability Cash Received ContractWithCustomerLiabilityCashReceived	2267000	USD
CY2019	oas	Contract With Customer Liability Cash Received ContractWithCustomerLiabilityCashReceived	2174000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	406000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	69000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	3966000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	2105000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	16921000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	17175000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	10896000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	11089000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	2768000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	58849000	USD
CY2020	us-gaap	Revenue Performance Obligation Description Of Timing RevenuePerformanceObligationDescriptionOfTiming	The partially and wholly unsatisfied performance obligations presented in the table above are generally limited to customer contracts which have fixed pricing and fixed volume terms and conditions, which generally include customer contracts with minimum volume commitment payment obligations.
CY2019Q4	us-gaap	Inventory Net InventoryNet	35259000	USD
CY2019Q4	oas	Inventory Noncurrent Linefill InventoryNoncurrentLinefill	13924000	USD
CY2020Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	14522000	USD
CY2019Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	13924000	USD
CY2020Q4	oas	Inventory Currentand Noncurrent InventoryCurrentandNoncurrent	48451000	USD
CY2019Q4	oas	Inventory Currentand Noncurrent InventoryCurrentandNoncurrent	49183000	USD
CY2020Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	206645000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	372440000	USD
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	106000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1259000	USD
CY2020Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	206539000	USD
CY2019Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	371181000	USD
CY2020Q4	oas	Revenue Suspense RevenueSuspense	66602000	USD
CY2019Q4	oas	Revenue Suspense RevenueSuspense	78950000	USD
CY2020Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	65412000	USD
CY2019Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	133092000	USD
CY2020Q4	oas	Production Taxes Payable ProductionTaxesPayable	14483000	USD
CY2019Q4	oas	Production Taxes Payable ProductionTaxesPayable	21048000	USD
CY2020Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	146497000	USD
CY2019Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	233090000	USD
CY2020Q4	oas	Accrued Capital Costs AccruedCapitalCosts	39380000	USD
CY2019Q4	oas	Accrued Capital Costs AccruedCapitalCosts	128592000	USD
CY2020Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	18635000	USD
CY2019Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	34151000	USD
CY2020Q4	oas	Accrued Bulk Purchases AccruedBulkPurchases	8967000	USD
CY2019Q4	oas	Accrued Bulk Purchases AccruedBulkPurchases	51087000	USD
CY2020Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	35249000	USD
CY2019Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	41843000	USD
CY2020Q4	oas	Accrued Well Servicesand Midstream Operating Expense AccruedWellServicesandMidstreamOperatingExpense	15051000	USD
CY2019Q4	oas	Accrued Well Servicesand Midstream Operating Expense AccruedWellServicesandMidstreamOperatingExpense	17958000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	9002000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	7448000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	126284000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	281079000	USD
CY2020Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	4300000	USD
CY2019Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Assets DerivativeCreditRiskValuationAdjustmentDerivativeAssets	500000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-94091000	USD
CY2020Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-84615000	USD
CY2020Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-84615000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	233565000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-106314000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	28457000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	467000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	467000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	97688000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	3130000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	94558000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	3928000	USD
CY2019Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	2754000	USD
CY2019Q4	us-gaap	Derivative Assets DerivativeAssets	1174000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	34498000	USD
CY2019Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	14683000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	19815000	USD
CY2020Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	770117000	USD
CY2019Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	8724376000	USD
CY2020Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	12403000	USD
CY2019Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	3601019000	USD
CY2020Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	757714000	USD
CY2019Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	5123357000	USD
CY2020Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	40211000	USD
CY2019Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	738662000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	935950000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	1279653000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	5088000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	163896000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	930862000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	1115757000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1728787000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6977776000	USD
	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	15900000	USD
	us-gaap	Production Related Impairments Or Charges ProductionRelatedImpairmentsOrCharges	1500000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	15000000.0	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	28700000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	700000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2723000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2723000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2723000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2723000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	959000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	3149000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	710000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2711573000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	710000000.0	USD
	us-gaap	Interest Expense Debt InterestExpenseDebt	28000000.0	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	52449000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1519000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	770000	USD
CY2019	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2939000	USD
CY2019	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	647000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	56784000	USD
	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	535000	USD
	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	196000	USD
	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2775000	USD
CY2020Q4	oas	Asset Retirement Obligation Fresh Start Adjustment AssetRetirementObligationFreshStartAdjustment	-11681000	USD
CY2020Q4	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	27000	USD
CY2020Q4	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2918000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	93000	USD
CY2020Q4	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-36000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-16000	USD
	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-221277000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	48217000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	48217000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	35000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	342000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	48594000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	2200000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	300000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	500000	USD
CY2020Q4	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-36000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-43000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-70000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	23000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-28148000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-3553000	USD
CY2020Q4	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-529000	USD
	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-41649000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4551000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2313000	USD
CY2020Q4	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3447000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-262926000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-32699000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5866000	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3447000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-262962000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-32715000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5843000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2020Q4	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-10376000	USD
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-837391000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-25906000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.2100
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-5322000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0278
CY2020Q4	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1373000	USD
	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0233
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-93063000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0290
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-3573000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0208
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-527000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.0168
CY2020Q4	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	830000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.0044
	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-17699000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.0640
CY2019	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	7895000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.1309
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	3317000	USD
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	0
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	0	USD
	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.0003
	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	1372000	USD
CY2019	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.0170
CY2019	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	2094000	USD
CY2018	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.0950
CY2018	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	2408000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0
CY2020Q4	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.0022
	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	8687000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.0175
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	2163000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.0368
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	932000	USD
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate Percent EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRatePercent	0
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRate	0	USD
	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate Percent EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRatePercent	0
	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRate	0	USD
CY2019	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate Percent EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRatePercent	0
CY2019	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRate	0	USD
CY2018	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate Percent EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRatePercent	-0.1373
CY2018	oas	Effective Income Tax Rate Reconciliation Changein State Deferred Tax Rate EffectiveIncomeTaxRateReconciliationChangeinStateDeferredTaxRate	3479000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.1809
CY2020Q4	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	8936000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.1388
	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	553580000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.0674
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1707000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2020Q4	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.0734
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	1859000	USD
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Percent EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsPercent	-0.0047
CY2020Q4	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Amount EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsAmount	232000	USD
	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Percent EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsPercent	-0.0214
	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Amount EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsAmount	85149000	USD
CY2019	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Percent EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsPercent	0
CY2019	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Amount EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsAmount	0	USD
CY2018	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Percent EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsPercent	0
CY2018	oas	Effective Income Tax Rate Reconciliation Discharge Of Debt And Other Reorganization Items Amount EffectiveIncomeTaxRateReconciliationDischargeOfDebtAndOtherReorganizationItemsAmount	0	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.0007
CY2020Q4	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-36000	USD
	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.0003
	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	1005000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.0033
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	402000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.0041
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-104000	USD
CY2020Q4	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0697
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-3447000	USD
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.0659
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-262962000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2652
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-32715000	USD
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2305
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-5843000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	34691000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	191022000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	566856000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	1732000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	8799000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	22248000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	3946000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	1663000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	1643000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5761000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	632951000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	205410000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	565409000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2915000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	67542000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	202495000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	426130000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2020Q4	oas	Deferred Tax Liabilities Investmentin Subsidiaries DeferredTaxLiabilitiesInvestmentinSubsidiaries	67210000	USD
CY2019Q4	oas	Deferred Tax Liabilities Investmentin Subsidiaries DeferredTaxLiabilitiesInvestmentinSubsidiaries	38015000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	1316000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	5707000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	68526000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	469852000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	984000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	267357000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	565400000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	2900000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	37.35
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	16050000	shares
	oas	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelled	2147101	shares
	oas	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledWeightedAverageGrantDateFairValue	8.31
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7800000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6800000	USD
CY2020Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.375
CY2020Q4	us-gaap	Shares Issued SharesIssued	65000000	shares
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	60000000	shares
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	94.57
CY2020Q4	oas	Reorganization Fair Value Assumptions Risk Free Interest Rate ReorganizationFairValueAssumptionsRiskFreeInterestRate	0.0031
CY2020Q4	oas	Reorganization Fair Value Assumptions Dividend Yield ReorganizationFairValueAssumptionsDividendYield	0
CY2020Q4	oas	Reorganization Fair Value Assumptions Expected Term ReorganizationFairValueAssumptionsExpectedTerm	P4Y
CY2020Q4	oas	Reorganization Fair Value Assumptions Expected Votality Rate ReorganizationFairValueAssumptionsExpectedVotalityRate	0.650
CY2020Q4	oas	Reorganization Fair Value Assumptions Common Stock Per Share ReorganizationFairValueAssumptionsCommonStockPerShare	47.09
CY2020Q4	oas	Reorganization Fair Value Assumptions Warrants And Rights Outstanding ReorganizationFairValueAssumptionsWarrantsAndRightsOutstanding	23805000	USD
CY2018	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2020	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2019	us-gaap	Dilutive Securities DilutiveSecurities	0	USD
CY2020Q4	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	19991000	shares
	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	317644000	shares
CY2019	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	315002000	shares
CY2018	us-gaap	Weighted Average Number Of Share Outstanding Basic And Diluted WeightedAverageNumberOfShareOutstandingBasicAndDiluted	307480000	shares
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segment
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segment
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	119915000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	38776000	USD
CY2020Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-88185000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-49409000	USD
CY2020Q4	us-gaap	Assets Assets	2159037000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1728787000	USD
CY2020Q4	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	18072000	USD
CY2020Q4	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	16094000	USD
CY2020Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	14224000	USD
CY2020Q4	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	270000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	963419000	USD
	us-gaap	Operating Income Loss OperatingIncomeLoss	-4911759000	USD
	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	924186000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-3987573000	USD
	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	225341000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	291115000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	145294000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	31315000	USD
	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	4937143000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2071744000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2071744000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	154423000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-277785000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-123362000	USD
CY2019Q4	us-gaap	Assets Assets	7499253000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6977776000	USD
CY2019	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	843368000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	787192000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	123506000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	33607000	USD
CY2019	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	10257000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2321947000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2321947000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	119012000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-144355000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-25343000	USD
CY2018Q4	us-gaap	Assets Assets	7626142000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	7027109000	USD
CY2018	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	2203453000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	636296000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	121346000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	29273000	USD
CY2018	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	384228000	USD
CY2020Q4	us-gaap	Operating Lease Cost OperatingLeaseCost	751000	USD
	us-gaap	Operating Lease Cost OperatingLeaseCost	5797000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	26341000	USD
CY2020Q4	us-gaap	Variable Lease Cost VariableLeaseCost	437000	USD
	us-gaap	Variable Lease Cost VariableLeaseCost	2678000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	9189000	USD
CY2020Q4	us-gaap	Short Term Lease Cost ShortTermLeaseCost	554000	USD
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	9807000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4657000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	153000	USD
	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1987000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	2543000	USD
CY2020Q4	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	11000	USD
	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	167000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	260000	USD
CY2020Q4	us-gaap	Lease Cost LeaseCost	1906000	USD
	us-gaap	Lease Cost LeaseCost	20436000	USD
CY2019	us-gaap	Lease Cost LeaseCost	42990000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	10600000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P7Y1M6D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.039
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2744000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1722000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1548000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	1210000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	787000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	260000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	102000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	45000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	45000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	594000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	5181000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	3876000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	211000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	346000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	4970000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	3530000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6083000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	18497000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	3419000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	6303000	USD
CY2020Q4	oas	Lessee Right Of Use Asset LesseeRightOfUseAsset	9502000	USD
CY2019Q4	oas	Lessee Right Of Use Asset LesseeRightOfUseAsset	24800000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	2607000	USD
CY2020Q4	oas	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	200000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	6182000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	1626000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	2413000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	2362000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	17915000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	1904000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	3958000	USD
CY2020Q4	oas	Lessee Lease Liability LesseeLeaseLiability	8499000	USD
CY2019Q4	oas	Lessee Lease Liability LesseeLeaseLiability	30468000	USD
CY2019Q4	oas	Finance Lease Right Of Use Asset Accumulated Depreciation FinanceLeaseRightOfUseAssetAccumulatedDepreciation	-2300000	USD
CY2020Q4	us-gaap	Operating Lease Payments OperatingLeasePayments	1992000	USD
	us-gaap	Operating Lease Payments OperatingLeasePayments	6624000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	30316000	USD
CY2020Q4	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	9000	USD
	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	145000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	260000	USD
CY2020Q4	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	202000	USD
	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1989000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	2382000	USD
CY2020Q4	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	797000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	12746000	USD
CY2020Q4	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	24000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	3433000	USD
CY2020Q4	oas	Right Of Use Asset Reduced From Reduction Operating Lease Liability RightOfUseAssetReducedFromReductionOperatingLeaseLiability	6255000	USD
	oas	Right Of Use Asset Reduced From Reduction Operating Lease Liability RightOfUseAssetReducedFromReductionOperatingLeaseLiability	0	USD
CY2019	oas	Right Of Use Asset Reduced From Reduction Operating Lease Liability RightOfUseAssetReducedFromReductionOperatingLeaseLiability	0	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P2Y7M6D
CY2020Q4	us-gaap	Other Commitment Due In Fifth Year OtherCommitmentDueInFifthYear	69287000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.041
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y7M6D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P4Y1M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.036
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.039
CY2020Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	89118000	USD
CY2020Q4	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	102038000	USD
CY2020Q4	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	96174000	USD
CY2020Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	83543000	USD
CY2020Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	770117000	USD
CY2019Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	8724376000	USD
CY2020Q4	us-gaap	Other Commitment Due After Fifth Year OtherCommitmentDueAfterFifthYear	84836000	USD
CY2020Q4	us-gaap	Other Commitment OtherCommitment	524996000	USD
CY2020Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	12403000	USD
CY2019Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	3601019000	USD
CY2020Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	757714000	USD
CY2019Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	5123357000	USD
CY2020Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	40211000	USD
CY2019Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	738662000	USD
CY2020Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	797925000	USD
CY2019Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	5862019000	USD
CY2020Q4	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	0	USD
	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	0	USD
CY2019	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	0	USD
CY2018	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	260034000	USD
CY2020Q4	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	336000	USD
	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	536000	USD
CY2019	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	23058000	USD
CY2018	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	696293000	USD
CY2020Q4	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	105000	USD
	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	1225000	USD
CY2019	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	67470000	USD
CY2018	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	53928000	USD
CY2020Q4	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	14624000	USD
	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	199537000	USD
CY2019	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	542133000	USD
CY2018	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	923562000	USD
CY2020Q4	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	35000	USD
	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	181000	USD
CY2019	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	2083000	USD
CY2018	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	5804000	USD
CY2020Q4	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	15100000	USD
	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	201479000	USD
CY2019	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	634744000	USD
CY2018	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	1939621000	USD
CY2017Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	224960	MBbls
CY2017Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	312204	MBoe
CY2018	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-17352	MBbls
CY2018	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	3019	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-16850	MBoe
CY2017Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	523456	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	30640	MBbls
CY2018	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	46309	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	23050	MBbls
CY2018	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	38358	MBoe
CY2018	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	12470	MBbls
CY2018	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	20735	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	15926	MBoe
CY2018	srt	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	25688	MBbls
CY2018	srt	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	43107	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	32873	MBoe
CY2018	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	42430	MMcf
CY2018	srt	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	30122	MBoe
CY2018Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	228416	MBbls
CY2018Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	552726	MMcf
CY2018Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	320537	MBoe
CY2018Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	144533	MBbls
CY2018Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	339444	MMcf
CY2018Q4	srt	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	201107	MBoe
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	2792921000	USD
CY2018Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	83883	MBbls
CY2018Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	213282	MMcf
CY2018Q4	srt	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	119430	MBoe
CY2018Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	228416	MBbls
CY2018Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	552726	MMcf
CY2018Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	320537	MBoe
CY2019	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-51965	MBbls
CY2019	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-68301	MMcf
CY2019	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-63349	MBoe
CY2019	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	49297	MBbls
CY2019	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	87382	MMcf
CY2019	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	63861	MBoe
CY2019	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	2136	MBbls
CY2019	srt	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	2368	MMcf
CY2019	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	2531	MBoe
CY2019	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	22825	MBbls
CY2019	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	55906	MMcf
CY2019	srt	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	32142	MBoe
CY2019Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	200787	MBbls
CY2019Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	513533	MMcf
CY2019Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	286376	MBoe
CY2019Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	113418	MBbls
CY2019Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	314000	MMcf
CY2019Q4	srt	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	165751	MBoe
CY2019Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	87369	MBbls
CY2019Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	199533	MMcf
CY2019Q4	srt	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	120625	MBoe
CY2019Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	200787	MBbls
CY2019Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	513533	MMcf
CY2019Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	286376	MBoe
CY2020	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-69782	MBbls
CY2020	srt	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-98815	MMcf
CY2020	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-86251	MBoe
CY2020	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	4578	MBbls
CY2020	srt	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	8659	MMcf
CY2020	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	6021	MBoe
CY2020	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	15818	MBbls
CY2020	srt	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	47207	MMcf
CY2020	srt	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	23686	MBoe
CY2020Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	119765	MBbls
CY2020Q4	srt	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	376170	MMcf
CY2020Q4	srt	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	182460	MBoe
CY2020Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	85428	MBbls
CY2020Q4	srt	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	262676	MMcf
CY2020Q4	srt	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	129207	MBoe
CY2020Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	34337	MBbls
CY2020Q4	srt	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	113494	MMcf
CY2020Q4	srt	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	53253	MBoe
CY2020	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-86300	MBoe
CY2020	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	-0.30
CY2019	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-63300	MMBoe
CY2019	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	-0.20
CY2018	srt	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-16900	MMBoe
CY2018	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	-0.05
CY2018	oas	Proved Developed Reserve Revisionof Previous Estimate ProvedDevelopedReserveRevisionofPreviousEstimate	-20200	MMBoe
CY2020	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	6000.0	MMBoe
CY2020	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	3200	MBoe
CY2020	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	2800	MMBoe
CY2019	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	63900	MMBoe
CY2019	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	10300	MBoe
CY2019	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	0.60
CY2019	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	53600	MMBoe
CY2018	srt	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	38400	MMBoe
CY2018	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	9000.0	MBoe
CY2018	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	0.77
CY2018	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	29400	MMBoe
CY2018	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	0.76
CY2020Q4	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	0	MMBoe
	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	0	MMBoe
CY2019	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	2500	MMBoe
CY2018	srt	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	15900	MMBoe
CY2019	srt	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	0	MMBoe
CY2017	srt	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	32900	MMBoe
CY2020	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	39.54
CY2020	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.03
CY2019	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	55.85
CY2019	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.62
CY2018	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	65.66
CY2018	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	3.16
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	5197220000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	12385040000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	16652405000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	7373170000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5196569000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	4050306000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	5509127000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	6609097000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	610658000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	1490521000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	1701672000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	232849000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	188823000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	968466000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	1560792000	USD
CY2020Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	611915000	USD
CY2019Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2352200000	USD
CY2018Q4	srt	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	3322864000	USD
CY2020Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	948877000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2844369000	USD
CY2020	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	407417000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2844369000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	4050306000	USD
CY2017Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	3300695000	USD
CY2020	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-1088936000	USD
CY2019	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-1070192000	USD
CY2018	srt	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	1003008000	USD
CY2020	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	4640000	USD
CY2019	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	131003000	USD
CY2018	srt	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	-89304000	USD
CY2019	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	943989000	USD
CY2018	srt	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	1155223000	USD
CY2020	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2019	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2018	srt	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	385763000	USD
CY2020	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2019	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	36907000	USD
CY2018	srt	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	197867000	USD
CY2020	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-694320000	USD
CY2019	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-732253000	USD
CY2018	srt	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-115015000	USD
CY2020	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	87640000	USD
CY2019	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	246311000	USD
CY2018	srt	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	303364000	USD
CY2020	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	293445000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	467426000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	368374000	USD
CY2020	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-76066000	USD
CY2019	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	533872000	USD
CY2018	srt	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-240908000	USD
CY2020	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-62171000	USD
CY2019	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-238908000	USD
CY2018	srt	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	26223000	USD
CY2020Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	948877000	USD
CY2019Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2844369000	USD
CY2018Q4	srt	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	4050306000	USD

Files In Submission

Name	View Source	Status
0001486159-21-000017-index-headers.html	Edgar Link	pending
0001486159-21-000017-index.html	Edgar Link	pending
0001486159-21-000017.txt	Edgar Link	pending
0001486159-21-000017-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
oas-12312020xex21120master.htm	Edgar Link	pending
oas-12312020xex23120master.htm	Edgar Link	pending
oas-12312020xex31120master.htm	Edgar Link	pending
oas-12312020xex31220master.htm	Edgar Link	pending
oas-12312020xex32120master.htm	Edgar Link	pending
oas-12312020xex32220master.htm	Edgar Link	pending
oas-20201231.htm	Edgar Link	pending
oas-20201231.xsd	Edgar Link	pending
oas-20201231_cal.xml	Edgar Link	unprocessable
oas-20201231_def.xml	Edgar Link	unprocessable
oas-20201231_g1.jpg	Edgar Link	pending
oas-20201231_htm.xml	Edgar Link	completed
oas-20201231_lab.xml	Edgar Link	unprocessable
oas-20201231_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R116.htm	Edgar Link	pending
R117.htm	Edgar Link	pending
R118.htm	Edgar Link	pending
R119.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R120.htm	Edgar Link	pending
R121.htm	Edgar Link	pending
R122.htm	Edgar Link	pending
R123.htm	Edgar Link	pending
R124.htm	Edgar Link	pending
R125.htm	Edgar Link	pending
R126.htm	Edgar Link	pending
R127.htm	Edgar Link	pending
R128.htm	Edgar Link	pending
R129.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
R9999.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$CHRD
Chord Energy Corp Stock $chrd

2020 Q4 Form 10-K Financial Statement

#000148615921000017 Filed on March 08, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD Chord Energy Corp Stock $chrd

2020 Q4 Form 10-K Financial Statement

#000148615921000017 Filed on March 08, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD
Chord Energy Corp Stock $chrd