$CHRD
Chord Energy Corp Stock $chrd

$chrd Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000148615918000010 Filed on February 28, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017
Revenue	$404.5M	$304.7M	$1.248B
YoY Change	85.54%	71.87%	77.17%
Cost Of Revenue	$170.8M	$101.5M	$454.7M
YoY Change	191.47%	73.5%	108.56%
Gross Profit	$278.9M	$203.2M	$839.0M
YoY Change	74.97%	71.04%	72.41%
Gross Profit Margin	68.95%	66.68%	67.21%
Selling, General & Admin	$39.60M	$37.60M	$147.5M
YoY Change	-1.98%	18.61%	10.62%
% of Gross Profit	14.2%	18.5%	17.58%
Research & Development	$7.600M	$900.0K	$11.60M
YoY Change	1166.67%	80.0%	549.86%
% of Gross Profit	2.72%	0.44%	1.38%
Depreciation & Amortization	$146.6M	$132.3M	$530.8M
YoY Change	22.78%	18.17%	11.44%
% of Gross Profit	52.56%	65.1%	63.26%
Operating Expenses	$193.8M	$170.8M	$689.9M
YoY Change	20.82%	18.53%	12.83%
Operating Profit	$86.10M	$32.39M	$144.0M
YoY Change	-5158.93%	-226.04%	-210.04%
Interest Expense	-$160.2M	$37.39M	$146.8M
YoY Change	89.36%	17.85%	4.66%
% of Operating Profit	-186.06%	115.42%	101.99%
Other Income/Expense, Net	-$600.0K	-$92.30M	-$219.8M
YoY Change		270.24%	-8.68%
Pretax Income	-$74.70M	-$59.91M	-$75.86M
YoY Change	-13.54%	18.32%	-79.58%
Income Tax	-$30.90M	-$18.85M	-$203.3M
% Of Pretax Income
Net Earnings	$124.6M	-$41.21M	$123.8M
YoY Change	-327.87%	21.42%	-150.94%
Net Earnings / Revenue	30.81%	-13.52%	9.92%
Basic Earnings Per Share	$0.52	-$0.18	$0.53
Diluted Earnings Per Share	$0.52	-$0.18	$0.52
COMMON SHARES
Basic Shares Outstanding	237.3M shares	233.4M shares	235.0M shares
Diluted Shares Outstanding		233.4M shares	237.9M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017
SHORT-TERM ASSETS
Cash & Short-Term Investments	$16.70M	$8.500M	$16.72M
YoY Change	49.11%	-38.41%	48.94%
Cash & Equivalents	$16.72M	$8.488M	$16.72M
Short-Term Investments
Other Short-Term Assets	$193.0K	$65.00K	$8.168M
YoY Change	-95.57%	-98.48%	-33.81%
Inventory	$19.37M	$17.17M	$19.37M
Prepaid Expenses	$7.631M	$10.65M
Receivables	$371.4M	$285.4M	$371.4M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$415.6M	$322.4M	$415.6M
YoY Change	74.23%	44.69%	74.23%
LONG-TERM ASSETS
Property, Plant & Equipment	$6.173B	$6.036B	$6.173B
YoY Change	4.29%	17.14%	4.29%
Goodwill
YoY Change
Intangibles	$0.00
YoY Change
Long-Term Investments
YoY Change
Other Assets	$21.60M	$21.56M	$33.81M
YoY Change	5.28%	-4.38%	64.79%
Total Long-Term Assets	$6.207B	$6.069B	$6.207B
YoY Change	4.5%	17.26%	4.5%
TOTAL ASSETS
Total Short-Term Assets	$415.6M	$322.4M	$415.6M
Total Long-Term Assets	$6.207B	$6.069B	$6.207B
Total Assets	$6.623B	$6.391B	$6.623B
YoY Change	7.19%	18.39%	7.19%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$13.37M	$16.35M	$13.37M
YoY Change	187.84%	106.18%	187.84%
Accrued Expenses	$244.3M	$194.2M	$283.2M
YoY Change	104.98%	96.26%	79.07%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$631.3M	$421.7M	$631.3M
YoY Change	65.64%	44.84%	65.64%
LONG-TERM LIABILITIES
Long-Term Debt	$2.098B	$2.341B	$2.098B
YoY Change	-8.69%	10.12%	-8.69%
Other Long-Term Liabilities	$6.182M	$5.805M	$74.54M
YoY Change	111.86%	94.02%	17.18%
Total Long-Term Liabilities	$2.104B	$2.346B	$2.172B
YoY Change	-8.54%	10.23%	-7.99%
TOTAL LIABILITIES
Total Short-Term Liabilities	$631.3M	$421.7M	$631.3M
Total Long-Term Liabilities	$2.104B	$2.346B	$2.172B
Total Liabilities	$3.109B	$3.333B	$3.247B
YoY Change	-4.49%	10.69%	-0.25%
SHAREHOLDERS EQUITY
Retained Earnings	$718.0M	$593.4M
YoY Change	21.38%	-8.17%
Common Stock	$2.680B	$2.371B
YoY Change	14.15%	34.96%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$22.18M	$22.13M
YoY Change	39.05%	39.24%
Treasury Stock Shares	1.332M shares	1.327M shares
Shareholders Equity	$3.376B	$2.943B	$3.376B
YoY Change
Total Liabilities & Shareholders Equity	$6.623B	$6.391B	$6.623B
YoY Change	7.19%	18.39%	7.19%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017
OPERATING ACTIVITIES
Net Income	$124.6M	-$41.21M	$123.8M
YoY Change	-327.87%	21.42%	-150.94%
Depreciation, Depletion And Amortization	$146.6M	$132.3M	$530.8M
YoY Change	22.78%	18.17%	11.44%
Cash From Operating Activities	$209.2M	$88.80M	$507.9M
YoY Change	100.0%	177.5%	122.74%
INVESTING ACTIVITIES
Capital Expenditures	$265.6M	$191.1M	-$709.2M
YoY Change	-69.38%	75.32%	-41.28%
Acquisitions			$61.87M
YoY Change			-92.08%
Other Investing Activities	-$6.200M	$7.400M	$2.681M
YoY Change	-169.66%	-39.34%	-98.04%
Cash From Investing Activities	-$271.8M	-$183.9M	-$714.8M
YoY Change	-68.34%	89.98%	-33.25%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$302.6M		$302.2M
YoY Change	-48.18%		-60.58%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	70.90M	92.00M	$212.4M
YoY Change	-90.57%	27.78%	-74.85%
NET CHANGE
Cash From Operating Activities	209.2M	88.80M	$507.9M
Cash From Investing Activities	-271.8M	-183.9M	-$714.8M
Cash From Financing Activities	70.90M	92.00M	$212.4M
Net Change In Cash	8.300M	-3.100M	$5.494M
YoY Change	-432.0%	-143.06%	267.25%
FREE CASH FLOW
Cash From Operating Activities	$209.2M	$88.80M	$507.9M
Capital Expenditures	$265.6M	$191.1M	-$709.2M
Free Cash Flow	-$56.40M	-$102.3M	$1.217B
YoY Change	-92.61%	32.86%	-15.23%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	oas	Inventory Noncurrent Linefill InventoryNoncurrentLinefill	12200000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0001486159
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	317595983	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1911153680	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Oasis Petroleum Inc.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	dei	Trading Symbol TradingSymbol	OAS
CY2016Q4	oas	Accrued Bulk Purchases AccruedBulkPurchases	0	USD
CY2017Q4	oas	Accrued Bulk Purchases AccruedBulkPurchases	13595000	USD
CY2016Q4	oas	Accrued Capital Costs AccruedCapitalCosts	69311000	USD
CY2017Q4	oas	Accrued Capital Costs AccruedCapitalCosts	154625000	USD
CY2016Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	19061000	USD
CY2017Q4	oas	Accrued General And Administrative Expense AccruedGeneralAndAdministrativeExpense	17915000	USD
CY2016Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	22221000	USD
CY2017Q4	oas	Accrued Lease Operating Expense AccruedLeaseOperatingExpense	26215000	USD
CY2016Q4	oas	Accrued Well Servicesand Midstream Operating Expense AccruedWellServicesandMidstreamOperatingExpense	2365000	USD
CY2017Q4	oas	Accrued Well Servicesand Midstream Operating Expense AccruedWellServicesandMidstreamOperatingExpense	15293000	USD
CY2015	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	26300	MBoe
CY2016	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	6500	MBoe
CY2017	oas	Additional Proved Undeveloped Reserves AdditionalProvedUndevelopedReserves	33300	MBoe
CY2016Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	7597000	USD
CY2017Q4	oas	Advances From Joint Interest Partners Current AdvancesFromJointInterestPartnersCurrent	4916000	USD
CY2016	oas	Asset Retirement Obligation Liabilities Heldfor Sale AssetRetirementObligationLiabilitiesHeldforSale	0	USD
CY2017	oas	Asset Retirement Obligation Liabilities Heldfor Sale AssetRetirementObligationLiabilitiesHeldforSale	0	USD
CY2016Q4	oas	Capital Contributions CapitalContributions	0	USD
CY2017Q4	oas	Capital Contributions CapitalContributions	0	USD
CY2015	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	609999000	USD
CY2016	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	1181527000	USD
CY2017	oas	Capital Expenditures Cashand Non Cash CapitalExpendituresCashandNonCash	836204000	USD
CY2015	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-260060000	USD
CY2016	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-43415000	USD
CY2017	oas	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	83508000	USD
CY2015	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	12299000	USD
CY2016	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	14334000	USD
CY2017	oas	Debt Discount Amortization And Other DebtDiscountAmortizationAndOther	18311000	USD
CY2016Q4	oas	Deferred Tax Liabilities Investmentin Subsidiaries DeferredTaxLiabilitiesInvestmentinSubsidiaries	0	USD
CY2017Q4	oas	Deferred Tax Liabilities Investmentin Subsidiaries DeferredTaxLiabilitiesInvestmentinSubsidiaries	25490000	USD
CY2017Q4	oas	Derivative Numberof Counterparties DerivativeNumberofCounterparties	8	counterparty
CY2017	oas	Discount Rate Of Future Cash Flows DiscountRateOfFutureCashFlows	0.1
CY2015	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	528000	USD
CY2016	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	796000	USD
CY2017	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationAmount	-792000	USD
CY2015	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.0094
CY2016	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	-0.0021
CY2017	oas	Effective Income Tax Rate Reconciliation Nondeductible Expense Executive Compensation Percent EffectiveIncomeTaxRateReconciliationNondeductibleExpenseExecutiveCompensationPercent	0.0105
CY2015	oas	Equity In Earnings In Subsidiaries EquityInEarningsInSubsidiaries	0	USD
CY2016	oas	Equity In Earnings In Subsidiaries EquityInEarningsInSubsidiaries	0	USD
CY2017	oas	Equity In Earnings In Subsidiaries EquityInEarningsInSubsidiaries	0	USD
CY2015	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	20400	MBoe
CY2016	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	6200	MBoe
CY2017	oas	Estimated Extensions And Discoveries Of Reserves Associated With New Wells EstimatedExtensionsAndDiscoveriesOfReservesAssociatedWithNewWells	17900	MBoe
CY2016Q4	oas	Inventory Currentand Noncurrent InventoryCurrentandNoncurrent	10648000	USD
CY2017Q4	oas	Inventory Currentand Noncurrent InventoryCurrentandNoncurrent	31567000	USD
CY2016Q4	oas	Inventory Noncurrent Linefill InventoryNoncurrentLinefill	0	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1600000	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7200000	USD
CY2017	oas	Ownership Percentage Guarantor OwnershipPercentageGuarantor	1
CY2015	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	0	USD
CY2016	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	310000	USD
CY2016Q4	oas	Investments In And Advances To Affiliates InvestmentsInAndAdvancesToAffiliates	0	USD
CY2017Q4	oas	Investments In And Advances To Affiliates InvestmentsInAndAdvancesToAffiliates	0	USD
CY2015	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	3972000	USD
CY2016	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	3810000	USD
CY2017	oas	Non Cash Asset Retirement Obligations NonCashAssetRetirementObligations	-789000	USD
CY2015	oas	Oiland Gas Revenue Bulk Sales OilandGasRevenueBulkSales	0	USD
CY2016	oas	Oiland Gas Revenue Bulk Sales OilandGasRevenueBulkSales	10272000	USD
CY2017	oas	Oiland Gas Revenue Bulk Sales OilandGasRevenueBulkSales	87989000	USD
CY2015	oas	Oiland Gas Rig Termination Expense OilandGasRigTerminationExpense	3895000	USD
CY2016	oas	Oiland Gas Rig Termination Expense OilandGasRigTerminationExpense	0	USD
CY2017	oas	Oiland Gas Rig Termination Expense OilandGasRigTerminationExpense	0	USD
CY2017	oas	Paymentsfor Costs Relatedto Divestitureof Businesses PaymentsforCostsRelatedtoDivestitureofBusinesses	366000	USD
CY2015	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	1
CY2016	oas	Percentage Of Proved Undeveloped Reserves PercentageOfProvedUndevelopedReserves	1
CY2015	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2016	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2017	oas	Percentage Of Reserves Produced From Wells PercentageOfReservesProducedFromWells	1
CY2015	oas	Proceed From Payments To Joint Interest Partners ProceedFromPaymentsToJointInterestPartners	-1969000	USD
CY2016	oas	Proceed From Payments To Joint Interest Partners ProceedFromPaymentsToJointInterestPartners	2950000	USD
CY2017	oas	Proceed From Payments To Joint Interest Partners ProceedFromPaymentsToJointInterestPartners	-2681000	USD
CY2016Q4	oas	Production Taxes Payable ProductionTaxesPayable	73033000	USD
CY2017Q4	oas	Production Taxes Payable ProductionTaxesPayable	126761000	USD
CY2017	oas	Proved Developed Reserve Revisionof Previous Estimate ProvedDevelopedReserveRevisionofPreviousEstimate	-14200	MBoe
CY2015	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	-0.31
CY2016	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	0.14
CY2017	oas	Proved Developedand Undeveloped Reserve Revisionof Previous Estimate Percentage ProvedDevelopedandUndevelopedReserveRevisionofPreviousEstimatePercentage	-0.06
CY2016Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	4590101000	USD
CY2017Q4	oas	Proved Oil And Gas Properties Net ProvedOilAndGasPropertiesNet	4663629000	USD
CY2017	oas	Proved Undeveloped Reserve Revisionof Previous Estimate ProvedUndevelopedReserveRevisionofPreviousEstimate	-5000	MBoe
CY2016	oas	Proved Undeveloped Reserves Decreasefrom Estimated Net Proved Reserve Balance Energy ProvedUndevelopedReservesDecreasefromEstimatedNetProvedReserveBalanceEnergy	71500	MBoe
CY2016	oas	Proved Undeveloped Reserves Numberof Locations ProvedUndevelopedReservesNumberofLocations	259	location
CY2016	oas	Proved Undeveloped Reserves Numberof Locations Net ProvedUndevelopedReservesNumberofLocationsNet	190.8	location
CY2016Q4	oas	Receivables Gross Current ReceivablesGrossCurrent	205644000	USD
CY2017Q4	oas	Receivables Gross Current ReceivablesGrossCurrent	365153000	USD
CY2016Q4	oas	Revenue Suspense RevenueSuspense	55484000	USD
CY2017Q4	oas	Revenue Suspense RevenueSuspense	68015000	USD
CY2016Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	139737000	USD
CY2017Q4	oas	Revenues Payable And Production Taxes Current RevenuesPayableAndProductionTaxesCurrent	213995000	USD
CY2017Q4	oas	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	171900000	USD
CY2017Q4	oas	Tax Cutsand Jobs Actof2017 Incomplete Accounting Existing Deferred Tax Asset TaxCutsandJobsActof2017IncompleteAccountingExistingDeferredTaxAsset	3100000	USD
CY2015	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	50.16
CY2016	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	42.60
CY2017	oas	Unweighted Arithmetic Average First Day Of Month Prices UnweightedArithmeticAverageFirstDayOfMonthPrices	51.34
CY2015	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.63
CY2016	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.47
CY2017	oas	Unweighted Arithmetic Average First Day Of Month Prices For Natural Gas UnweightedArithmeticAverageFirstDayOfMonthPricesForNaturalGas	2.99
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	4645000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	13370000	USD
CY2016Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	137065000	USD
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	233660000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	204335000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	363580000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	119173000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	236480000	USD
CY2016Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	11220000	USD
CY2017Q4	us-gaap	Accrued Royalties Current AccruedRoyaltiesCurrent	19219000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1995791000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2534215000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2345271000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2677217000	USD
CY2015	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2949000	USD
CY2016	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2330000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	6229000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	56720000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	55000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1309000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1300000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	1573000	USD
CY2016Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	2097000	USD
CY2017Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	0	USD
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2881000	shares
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	35812000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	49687000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	9800000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	7000000	USD
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2842000	shares
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	5075000	shares
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	48799000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1973000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	2621000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	700000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	300000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	11811000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2449000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	480000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	5743000	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	571000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-215000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	48985000	USD
CY2017Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	48511000	USD
CY2015Q4	us-gaap	Assets Assets	5649375000	USD
CY2016Q4	us-gaap	Assets Assets	6178632000	USD
CY2017Q4	us-gaap	Assets Assets	6615130000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	238549000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	407835000	USD
CY2016Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	503000	USD
CY2017Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	495000	USD
CY2016Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	5409836000	USD
CY2017Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	5443802000	USD
CY2015	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	51803000	USD
CY2016	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	0	USD
CY2017	us-gaap	Capitalized Exploratory Well Cost Additions Pending Determination Of Proved Reserves CapitalizedExploratoryWellCostAdditionsPendingDeterminationOfProvedReserves	10000	USD
CY2017Q4	us-gaap	Capitalized Exploratory Well Costs That Have Been Capitalized For Period Greater Than One Year CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear	0	USD
CY2014Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	34522000	USD
CY2015Q4	us-gaap	Capitalized Exploratory Well Costs CapitalizedExploratoryWellCosts	2097000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	45811000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9730000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11226000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16720000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-36081000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1496000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	5494000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	450000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	450000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	237201064	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	270627014	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	236344172	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	269295466	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	2331000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	2668000	USD
CY2015	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	0	USD
CY2016	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	10258000	USD
CY2017	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	89320000	USD
CY2015	us-gaap	Cost Of Services Oil And Gas CostOfServicesOilAndGas	24782000	USD
CY2016	us-gaap	Cost Of Services Oil And Gas CostOfServicesOilAndGas	20675000	USD
CY2017	us-gaap	Cost Of Services Oil And Gas CostOfServicesOilAndGas	37228000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	903899000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	834195000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	1106230000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	469541000	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	1018547000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	587838000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	28737000	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	781522000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	61874000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	3226000	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	672000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	5424000	USD
CY2015	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	1474000	USD
CY2016	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	26795000	USD
CY2017	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	-2965000	USD
CY2015	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	433735000	USD
CY2016	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	207766000	USD
CY2017	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	511905000	USD
CY2015	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	2369000	USD
CY2016	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	1792000	USD
CY2017	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	11600000	USD
CY2016Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	4724000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-420000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-9000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-420000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-9000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	0	USD
CY2015	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2016	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	57770000	USD
CY2017	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	9024000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-11667000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-117781000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-199370000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	29000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	USD
CY2017Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	0	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-16114000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-128538000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-202884000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	777397000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	528991000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	513529000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	305921000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-4447000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-10757000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3514000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	25738000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	30397000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	265212000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	224229000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	263868000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	223070000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	228279000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	182633000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	1712000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other Tax Carryforwards DeferredTaxAssetsOtherTaxCarryforwards	1099000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	9483000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	10100000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1344000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	1159000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	513529000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	305921000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	32420000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	18369000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	744977000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	485132000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	485322000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	476331000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	530802000	USD
CY2016Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	120000	USD
CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	0	USD
CY2016Q4	us-gaap	Derivative Assets DerivativeAssets	362000	USD
CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	353000	USD
CY2016Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	362000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	344000	USD
CY2016Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	0	USD
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	9000	USD
CY2016Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	2000000	USD
CY2017Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	2800000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	482000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	353000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	81002000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	137664000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Net DerivativeFairValueOfDerivativeNet	-135214000	USD
CY2015	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	210376000	USD
CY2016	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-105317000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-71657000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	72183000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	135567000	USD
CY2016Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	60469000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	115716000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	11714000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	19851000	USD
CY2016Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	8819000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	2097000	USD
CY2016Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2017Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2016Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2017Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.31
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.40
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.51
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.19
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.25
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.32
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.07
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.18
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	784727000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	992271000	USD
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.31
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.40
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.51
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.19
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.25
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.32
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.07
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.18
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.2860
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.3459
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	2.6801
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.0000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	2.2661
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.0000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	0.0000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Minority Interest Income Expense EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	-0.0168
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.0040
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	-0.0064
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Other EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther	0.0021
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.1017
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	-0.0183
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.0087
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0511
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0227
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.0259
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8700000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	8300000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6300000	USD
CY2016Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	7086000	USD
CY2017Q4	us-gaap	Energy Related Inventory Petroleum EnergyRelatedInventoryPetroleum	10427000	USD
CY2015	us-gaap	Exploration Expense ExplorationExpense	2369000	USD
CY2016	us-gaap	Exploration Expense ExplorationExpense	1785000	USD
CY2017	us-gaap	Exploration Expense ExplorationExpense	11600000	USD
CY2017Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	0	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	8582831000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	9426963000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	11636126000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	909562000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	225662000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	279345000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	580481000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3605090000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	4366234000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	5604956000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	3842517000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	3996657000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	4458418000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1690760000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	1883169000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	2304261000	USD
CY2015	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	0	USD
CY2016	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	-1303000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property GainLossOnSaleOfProperty	1774000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	4741000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2015	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	31610000	USD
CY2016	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	30108000	USD
CY2017	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	55740000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	89549000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	89342000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	91797000	USD
CY2015	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	46109000	USD
CY2016	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	4684000	USD
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	6887000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-56371000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-371554000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-75858000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-16123000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-128538000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-203304000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-171900000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-19730000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-130044000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-26550000	USD
CY2015	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	0	USD
CY2016	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	0	USD
CY2017	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	1278000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	228000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	2337000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-159000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	5734000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	6808000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-659000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-2883000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-8435000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1966000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	0	USD
CY2016	us-gaap	Income Taxes Paid IncomeTaxesPaid	0	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	12000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-71617000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-13839000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	115308000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-108461000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	11923000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	158587000	USD
CY2015	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	150333000	USD
CY2016	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	69992000	USD
CY2017	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	-60929000	USD
CY2015	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	1391358000	USD
CY2016	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-36303000	USD
CY2017	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-238354000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-6873000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-254000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	2501000	USD
CY2015	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-6489000	USD
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	305000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-148000	USD
CY2015	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	6500000	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	4490000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-10450000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	950000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	151000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	12143000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-33000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	10000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-40000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-1828000	USD
CY2016	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	295000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	838000	USD
CY2015	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	14378000	USD
CY2016	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	533505000	USD
CY2017	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	6518000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2889000	shares
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	18600000	USD
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	16800000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	12800000	USD
CY2015	us-gaap	Interest Expense InterestExpense	149648000	USD
CY2016	us-gaap	Interest Expense InterestExpense	140305000	USD
CY2017	us-gaap	Interest Expense InterestExpense	146837000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	145333000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	138248000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	154980000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	39004000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	38963000	USD
CY2016Q4	us-gaap	Inventory Net InventoryNet	10648000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	19367000	USD
CY2016Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	0	USD
CY2017Q4	us-gaap	Inventory Noncurrent InventoryNoncurrent	12200000	USD
CY2015	us-gaap	Lease Operating Expense LeaseOperatingExpense	144481000	USD
CY2016	us-gaap	Lease Operating Expense LeaseOperatingExpense	135444000	USD
CY2017	us-gaap	Lease Operating Expense LeaseOperatingExpense	177134000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	3255475000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	3101551000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6178632000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6615130000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	381115000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	623480000	USD
CY2016Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	72183000	USD
CY2017Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	135567000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	2297214000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	2097606000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2297214000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2097606000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	137888000	USD
CY2015	us-gaap	Natural Gas Midstream Costs NaturalGasMidstreamCosts	6198000	USD
CY2016	us-gaap	Natural Gas Midstream Costs NaturalGasMidstreamCosts	9003000	USD
CY2017	us-gaap	Natural Gas Midstream Costs NaturalGasMidstreamCosts	17589000	USD
CY2015	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	23769000	USD
CY2016	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	35406000	USD
CY2017	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	72752000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	83252000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	844306000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	212378000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-479148000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1070828000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-714760000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	359815000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	228018000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	507876000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-40248000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-64455000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	-33942000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	-54688000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	-89931000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-243016000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	23825000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	16568000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	-41214000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	124617000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	123796000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3650000	USD
CY2015	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-3201195000	USD
CY2016	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-367527000	USD
CY2017	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	881993000	USD
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	4875000	USD
CY2015	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	0	USD
CY2016	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	4000000	USD
CY2017	us-gaap	Noncash Or Part Noncash Divestiture Amount Of Consideration Received1 NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1	0	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	134185000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	57793000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-240721000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-219826000	USD
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	3	Segment
CY2016Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	40322000	USD
CY2017Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	73588000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	1886732000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Accumulated Depreciation Depletion And Amortization OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization	2395153000	USD
CY2016Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	7296568000	USD
CY2017Q4	us-gaap	Oil And Gas Property Successful Effort Method Gross OilAndGasPropertySuccessfulEffortMethodGross	7838955000	USD
CY2015	us-gaap	Oil And Gas Revenue OilAndGasRevenue	789735000	USD
CY2016Q1	us-gaap	Oil And Gas Revenue OilAndGasRevenue	130283000	USD
CY2016Q2	us-gaap	Oil And Gas Revenue OilAndGasRevenue	179080000	USD
CY2016Q3	us-gaap	Oil And Gas Revenue OilAndGasRevenue	177311000	USD
CY2016Q4	us-gaap	Oil And Gas Revenue OilAndGasRevenue	217991000	USD
CY2016	us-gaap	Oil And Gas Revenue OilAndGasRevenue	704665000	USD
CY2017Q1	us-gaap	Oil And Gas Revenue OilAndGasRevenue	285116000	USD
CY2017Q2	us-gaap	Oil And Gas Revenue OilAndGasRevenue	254091000	USD
CY2017Q3	us-gaap	Oil And Gas Revenue OilAndGasRevenue	304748000	USD
CY2017Q4	us-gaap	Oil And Gas Revenue OilAndGasRevenue	404469000	USD
CY2017	us-gaap	Oil And Gas Revenue OilAndGasRevenue	1248424000	USD
CY2015	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	721672000	USD
CY2016	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	625233000	USD
CY2017	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	1034892000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	-114164000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-75215000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-28214000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-25702000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-1702000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	-130833000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	20092000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	5379000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	32394000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	86103000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	143968000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	46871000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	10378000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3975000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4447000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5435000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	6083000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	16553000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	7200000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6300000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	5100000	USD
CY2017Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	100700000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6215000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	8837000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	4355000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	193000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	20516000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	21600000	USD
CY2017Q4	us-gaap	Other Commitment OtherCommitment	442609000	USD
CY2017Q4	us-gaap	Other Commitment Due After Fifth Year OtherCommitmentDueAfterFifthYear	140200000	USD
CY2017Q4	us-gaap	Other Commitment Due In Fifth Year OtherCommitmentDueInFifthYear	54261000	USD
CY2017Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	64282000	USD
CY2017Q4	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	55092000	USD
CY2017Q4	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	63675000	USD
CY2017Q4	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	65099000	USD
CY2016Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	3562000	USD
CY2017Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	8940000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	10490000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	40000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	2918000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	6182000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2935000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	160000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-1332000	USD
CY2016Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	28257000	USD
CY2017	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	281000	USD
CY2017Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	57905000	USD
CY2015	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-370410000	USD
CY2016	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	-121977000	USD
CY2017	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	8264000	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	14632000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	9127000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2714000	USD
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2949000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	2330000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6229000	USD
CY2015	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	28817000	USD
CY2016	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	781522000	USD
CY2017	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	61874000	USD
CY2015	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	819847000	USD
CY2016	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	426256000	USD
CY2017	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	647349000	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	7623000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	7631000	USD
CY2015	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	216981000	USD
CY2016	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	91518000	USD
CY2017	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	157386000	USD
CY2015	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2016	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2017	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2015	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	5548000	USD
CY2016	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	5000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	134185000	USD
CY2016Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	182800000	USD
CY2016Q4	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	583900000	USD
CY2017Q4	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	302600000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	462833000	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	766670000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	302191000	USD
CY2015	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	300000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	630000000	USD
CY2016	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1407000000	USD
CY2017	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1162000000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-55000	USD
CY2016Q2	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	12800000	USD
CY2015	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	1075000	USD
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	14876	MBoe
CY2016	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	12333000	USD
CY2017	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	5774000	USD
CY2015	us-gaap	Production Tax Expense ProductionTaxExpense	69584000	USD
CY2016	us-gaap	Production Tax Expense ProductionTaxExpense	56565000	USD
CY2017	us-gaap	Production Tax Expense ProductionTaxExpense	88133000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	-40248000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	-64455000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	-89931000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	-33942000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	-54688000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	-243016000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	23825000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	16568000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	-41064000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	128117000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	127446000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5218242000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	5919567000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	6173486000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	618790000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	868746000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	109059000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Accumulated Depreciation PropertyPlantAndEquipmentOtherAccumulatedDepreciation	139062000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	509731000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	729684000	USD
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	46640	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	51153	MBoe
CY2014Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	272086	MBoe
CY2015Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	218233	MBoe
CY2016Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	305110	MBoe
CY2017Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	312204	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	18423	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	18436	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	24143	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	2565	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	66936	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	671	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-84635	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	31136	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-19200	MBoe
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	46072	MMcf
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	38962	MBbls
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	24520	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	10790	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	89489	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	10839	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	5828	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	1196	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	0	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	0	MMcf
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Extensions Discoveries And Additions ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions	36238	MBbls
CY2014Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	220120	MMcf
CY2014Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	235399	MBbls
CY2015Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	184928	MBbls
CY2015Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	199828	MMcf
CY2016Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	411104	MMcf
CY2016Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	236593	MBbls
CY2017Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	523456	MMcf
CY2017Q4	us-gaap	Proved Developed And Undeveloped Reserves Net ProvedDevelopedAndUndevelopedReservesNet	224960	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	14001	MMcf
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	16090	MBbls
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	19573	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	15174	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	31946	MMcf
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Production ProvedDevelopedAndUndevelopedReservesProduction	18818	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	2115	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	2702	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	100629	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	50164	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	466	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Purchases Of Minerals In Place ProvedDevelopedAndUndevelopedReservesPurchasesOfMineralsInPlace	1230	MMcf
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-75458	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-55065	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	116539	MMcf
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	11713	MBbls
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	54726	MMcf
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Revisions Of Previous Estimates Increase Decrease ProvedDevelopedAndUndevelopedReservesRevisionsOfPreviousEstimatesIncreaseDecrease	-28323	MBbls
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	0	MBoe
CY2016	us-gaap	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	7635	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	1387	MBoe
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Sales Of Minerals In Place ProvedDevelopedAndUndevelopedReservesSalesOfMineralsInPlace	1147	MMcf
CY2015Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	147577	MBoe
CY2016Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	190598	MBoe
CY2017Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	200812	MBoe
CY2015Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	120789	MMcf
CY2015Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	127445	MBbls
CY2016Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	152337	MBbls
CY2016Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	229568	MMcf
CY2017Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	301101	MMcf
CY2017Q4	us-gaap	Proved Developed Reserves Volume ProvedDevelopedReservesVolume	150628	MBbls
CY2016Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	6476833000	USD
CY2017Q4	us-gaap	Proved Oil And Gas Property Successful Effort Method ProvedOilAndGasPropertySuccessfulEffortMethod	7058782000	USD
CY2016Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	181536	MMcf
CY2015Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	70656	MBoe
CY2016Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	114512	MBoe
CY2017Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	111392	MBoe
CY2015	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	245675000	USD
CY2015Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	79039	MMcf
CY2015Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	57483	MBbls
CY2016	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	222117000	USD
CY2017	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	321007000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	591505000	USD
CY2017	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	112554000	USD
CY2016Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	84256	MBbls
CY2017Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	222355	MMcf
CY2017Q4	us-gaap	Proved Undeveloped Reserve Volume ProvedUndevelopedReserveVolume	74332	MBbls
CY2016Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	204335000	USD
CY2017Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	363580000	USD
CY2015	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	84228000	USD
CY2016	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	0	USD
CY2017	us-gaap	Reclassification To Well Facilities And Equipment Based On Determination Of Proved Reserves ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves	571000	USD
CY2015	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	992000000	USD
CY2016	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1182000000	USD
CY2017	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1377000000	USD
CY2015	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2016	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	435907000	USD
CY2017	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2015	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	472800000	USD
CY2016	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	462320000	USD
CY2017	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	515600000	USD
CY2015	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	0	USD
CY2016	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	0	USD
CY2017	us-gaap	Results Of Operations Dry Hole Costs ResultsOfOperationsDryHoleCosts	1536000	USD
CY2015	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	46109000	USD
CY2016	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	2252000	USD
CY2017	us-gaap	Results Of Operations Impairment Of Oil And Gas Properties ResultsOfOperationsImpairmentOfOilAndGasProperties	6887000	USD
CY2015	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-18382000	USD
CY2016	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-23665000	USD
CY2017	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	67244000	USD
CY2015	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-30794000	USD
CY2016	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-39576000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	717985000	USD
CY2015	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	44294000	USD
CY2016	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	33754000	USD
CY2017	us-gaap	Revenue Oil And Gas Services RevenueOilAndGasServices	52791000	USD
CY2015	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-946729000	USD
CY2016	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	333398000	USD
CY2017	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-78942000	USD
CY2015	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	477755000	USD
CY2016	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	403739000	USD
CY2017	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	769625000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	25272000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	24103000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	26534000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	16050000	shares
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-172681000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	4364000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	37463000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	548141000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	202272000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	262776000	USD
CY2014Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	3981661000	USD
CY2015Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1914330000	USD
CY2016Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	2483065000	USD
CY2017Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	3300695000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	462833000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	766670000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	302191000	USD
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	27405000	USD
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	25771000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	28160000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	2923157000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	3375691000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1872301000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2319342000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2923157000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3513579000	USD
CY2016Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	856892	shares
CY2017Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1331548	shares
CY2016Q4	us-gaap	Treasury Stock Value TreasuryStockValue	15950000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	22179000	USD
CY2016Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	819735000	USD
CY2017Q4	us-gaap	Unproved Oil And Gas Property Successful Effort Method UnprovedOilAndGasPropertySuccessfulEffortMethod	780173000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	130186000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	183615000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	237875000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130186000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	183615000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	234986000	shares
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;font-style:italic;font-weight:bold;">Concentrations of Market and Credit Risk</font></div><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;">The future results of the Company’s oil and natural gas operations will be affected by the market prices of oil and natural gas. The availability of a ready market for 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 oil and natural gas pipelines and other transportation facilities, any oversupply or undersupply of 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. The current global oversupply of crude oil has caused a sharp decline in oil prices since mid-2014, though recently oil prices have been improving. A substantial or extended decline in the price of oil could have a material adverse effect on the Company’s financial position, cash flows and results of operations.</font></div><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;">The Company operates in the exploration, development and production sector of the oil and gas industry. The Company’s receivables include amounts due from purchasers of its 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 an</font><font style="font-family:Times New Roman;font-size:10pt;">d joint interest partners are affected by periodic downturns in the economy in general or in their specific segment of the oil or natural gas industry, including the current period of low commodity prices, 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. In addition, a portion of the Company’s trade receivables are collateralized.</font></div><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">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.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;">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 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 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.</font></div><div style="line-height:120%;padding-top:6px;text-indent:0px;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;background-color:#ffffff;">Estimates of 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 subjective process of estimating underground accumulations of 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.</font></div></div>

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$CHRD
Chord Energy Corp Stock $chrd

2017 Q4 Form 10-K Financial Statement

#000148615918000010 Filed on February 28, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD Chord Energy Corp Stock $chrd

2017 Q4 Form 10-K Financial Statement

#000148615918000010 Filed on February 28, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CHRD
Chord Energy Corp Stock $chrd