$VTLE
Vital Energy, Inc. Stock $vtle

$vtle Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000152812918000026 Filed on February 15, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$240.3M	$205.8M	$187.0M
YoY Change	30.4%	28.85%	27.41%
Cost Of Revenue	$84.70M	$77.70M	$73.50M
YoY Change	13.39%	7.77%	1.52%
Gross Profit	$155.6M	$128.1M	$113.5M
YoY Change	41.97%	46.23%	52.55%
Gross Profit Margin	64.74%	62.24%	60.69%
Selling, General & Admin	$23.70M	$25.00M	$22.00M
YoY Change	-7.78%	-4.21%	7.32%
% of Gross Profit	15.23%	19.52%	19.38%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$45.10M	$41.21M	$38.00M
YoY Change	20.27%	17.22%	11.19%
% of Gross Profit	28.98%	32.17%	33.48%
Operating Expenses	$69.80M	$67.70M	$61.40M
YoY Change	8.72%	9.02%	10.63%
Operating Profit	$85.83M	$60.45M	$52.06M
YoY Change	88.81%	137.14%	191.27%
Interest Expense	$349.2M	$23.70M	$23.17M
YoY Change	-649.92%	2.69%	-1.44%
% of Operating Profit	406.84%	39.2%	44.51%
Other Income/Expense, Net		-$49.43M	$9.049M
YoY Change		208.77%	-110.13%
Pretax Income	$410.4M	$11.03M	$61.11M
YoY Change	-2330.43%	16.26%	-185.55%
Income Tax	$1.800M	$0.00	$0.00
% Of Pretax Income	0.44%	0.0%	0.0%
Net Earnings	$408.6M	$11.03M	$61.11M
YoY Change	-2317.91%	16.26%	-185.55%
Net Earnings / Revenue	170.0%	5.36%	32.68%
Basic Earnings Per Share	$1.71	$0.05	$0.26
Diluted Earnings Per Share	$1.70	$0.05	$0.25
COMMON SHARES
Basic Shares Outstanding	242.5M shares	239.3M shares	239.2M shares
Diluted Shares Outstanding		244.9M shares	244.4M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$112.2M	$20.80M	$35.00M
YoY Change	243.12%	-31.58%	81.35%
Cash & Equivalents	$112.2M	$20.82M	$35.02M
Short-Term Investments
Other Short-Term Assets	$15.69M	$16.20M	$17.55M
YoY Change	9.76%	13.03%	21.48%
Inventory	$9.100M	$8.600M	$8.600M
Prepaid Expenses	$6.538M
Receivables	$100.6M	$89.84M	$72.11M
Other Receivables	$5.245M	$80.00K	$139.0K
Total Short-Term Assets	$235.4M	$142.5M	$167.7M
YoY Change	52.08%	-25.17%	-20.64%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.768B	$1.631B	$1.499B
YoY Change	29.38%	24.94%	31.04%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$0.00	$276.4M	$249.5M
YoY Change	-100.0%	20.24%	16.79%
Other Assets	$16.11M	$11.76M	$12.01M
YoY Change	100.59%	36.36%	42.68%
Total Long-Term Assets	$1.788B	$1.924B	$1.774B
YoY Change	9.85%	22.85%	26.79%
TOTAL ASSETS
Total Short-Term Assets	$235.4M	$142.5M	$167.7M
Total Long-Term Assets	$1.788B	$1.924B	$1.774B
Total Assets	$2.023B	$2.066B	$1.941B
YoY Change	13.52%	17.64%	20.56%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$58.34M	$22.80M	$10.78M
YoY Change	11.76%	13.79%	-25.68%
Accrued Expenses	$181.7M	$151.6M	$119.7M
YoY Change	58.69%	47.76%	18.75%
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	$277.4M	$223.3M	$172.1M
YoY Change	47.61%	39.32%	11.88%
LONG-TERM LIABILITIES
Long-Term Debt	$791.9M	$1.441B	$1.390B
YoY Change	-41.51%	6.48%	-0.19%
Other Long-Term Liabilities	$134.1M	$3.330M	$3.457M
YoY Change	3603.12%	-11.03%	-10.07%
Total Long-Term Liabilities	$925.9M	$1.444B	$1.394B
YoY Change	-31.79%	6.44%	-0.21%
TOTAL LIABILITIES
Total Short-Term Liabilities	$277.4M	$223.3M	$172.1M
Total Long-Term Liabilities	$925.9M	$1.444B	$1.394B
Total Liabilities	$1.258B	$1.720B	$1.617B
YoY Change	-21.48%	9.61%	0.99%
SHAREHOLDERS EQUITY
Retained Earnings	-$1.669B	-$2.078B	-$2.089B
YoY Change	-24.75%	-5.55%	-5.45%
Common Stock	$2.435B	$2.424B	$2.413B
YoY Change	1.5%	1.56%	8.78%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$765.6M	$346.2M	$324.4M
YoY Change
Total Liabilities & Shareholders Equity	$2.023B	$2.066B	$1.941B
YoY Change	13.52%	17.64%	20.56%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$408.6M	$11.03M	$61.11M
YoY Change	-2317.91%	16.26%	-185.55%
Depreciation, Depletion And Amortization	$45.10M	$41.21M	$38.00M
YoY Change	20.27%	17.22%	11.19%
Cash From Operating Activities	$112.8M	$115.2M	$93.10M
YoY Change	1.81%	7.76%	13.4%
INVESTING ACTIVITIES
Capital Expenditures	-$170.5M	-$155.4M	-$127.5M
YoY Change	69.31%	-20.8%	36.22%
Acquisitions
YoY Change
Other Investing Activities	$822.4M	-$23.80M	$3.900M
YoY Change	-10510.13%	48.75%	-124.53%
Cash From Investing Activities	$652.0M	-$179.3M	-$123.6M
YoY Change	-700.92%	-15.54%	12.98%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-673.5M	50.00M	35.10M
YoY Change		-57.04%	1.45%
NET CHANGE
Cash From Operating Activities	112.8M	115.2M	93.10M
Cash From Investing Activities	652.0M	-179.3M	-123.6M
Cash From Financing Activities	-673.5M	50.00M	35.10M
Net Change In Cash	91.30M	-14.10M	4.600M
YoY Change	3869.57%	-228.18%	-36.99%
FREE CASH FLOW
Cash From Operating Activities	$112.8M	$115.2M	$93.10M
Capital Expenditures	-$170.5M	-$155.4M	-$127.5M
Free Cash Flow	$283.3M	$270.6M	$220.6M
YoY Change	33.95%	-10.72%	25.55%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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	0001528129
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	242534843	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	1300000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	Laredo Petroleum, Inc.
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016Q4	lpi	Accounts Receivable Matured Derivatives Current AccountsReceivableMaturedDerivativesCurrent	11059000	USD
CY2017Q4	lpi	Accounts Receivable Matured Derivatives Current AccountsReceivableMaturedDerivativesCurrent	641000	USD
CY2016Q4	lpi	Accounts Receivable Oil And Gas Sales Net Current AccountsReceivableOilAndGasSalesNetCurrent	46999000	USD
CY2017Q4	lpi	Accounts Receivable Oil And Gas Sales Net Current AccountsReceivableOilAndGasSalesNetCurrent	67116000	USD
CY2016Q4	lpi	Accounts Receivable Purchased Oil And Other Product Sales Current AccountsReceivablePurchasedOilAndOtherProductSalesCurrent	16213000	USD
CY2017Q4	lpi	Accounts Receivable Purchased Oil And Other Product Sales Current AccountsReceivablePurchasedOilAndOtherProductSalesCurrent	19504000	USD
CY2016Q4	lpi	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	30845000	USD
CY2017Q4	lpi	Accrued Capital Expenditures Current AccruedCapitalExpendituresCurrent	82721000	USD
CY2016Q4	lpi	Accumulated Depletion And Impairment Property Plant And Equipment AccumulatedDepletionAndImpairmentPropertyPlantAndEquipment	4500000000	USD
CY2017Q4	lpi	Accumulated Depletion And Impairment Property Plant And Equipment AccumulatedDepletionAndImpairmentPropertyPlantAndEquipment	4700000000	USD
CY2016Q4	lpi	Accumulated Depreciation Depletion Amortization And Impairment Property Plant And Equipment AccumulatedDepreciationDepletionAmortizationAndImpairmentPropertyPlantAndEquipment	4514183000	USD
CY2017Q4	lpi	Accumulated Depreciation Depletion Amortization And Impairment Property Plant And Equipment AccumulatedDepreciationDepletionAmortizationAndImpairmentPropertyPlantAndEquipment	4657466000	USD
CY2015	lpi	Allocated Sharebased Compensation Expense Gross AllocatedSharebasedCompensationExpenseGross	26830000	USD
CY2016	lpi	Allocated Sharebased Compensation Expense Gross AllocatedSharebasedCompensationExpenseGross	35240000	USD
CY2017	lpi	Allocated Sharebased Compensation Expense Gross AllocatedSharebasedCompensationExpenseGross	43297000	USD
CY2015	lpi	Amortization Of Financing Costs And Other Adjustments AmortizationOfFinancingCostsAndOtherAdjustments	4243000	USD
CY2016	lpi	Amortization Of Financing Costs And Other Adjustments AmortizationOfFinancingCostsAndOtherAdjustments	3922000	USD
CY2017	lpi	Amortization Of Financing Costs And Other Adjustments AmortizationOfFinancingCostsAndOtherAdjustments	3968000	USD
CY2016	lpi	Asset Retirement Obligation Settled Upon Plugging And Abandonment AssetRetirementObligationSettledUponPluggingAndAbandonment	1242000	USD
CY2017	lpi	Asset Retirement Obligation Settled Upon Plugging And Abandonment AssetRetirementObligationSettledUponPluggingAndAbandonment	408000	USD
CY2015	lpi	Capitalized Asset Retirement Cost CapitalizedAssetRetirementCost	13836000	USD
CY2016	lpi	Capitalized Asset Retirement Cost CapitalizedAssetRetirementCost	3660000	USD
CY2017	lpi	Capitalized Asset Retirement Cost CapitalizedAssetRetirementCost	787000	USD
CY2015	lpi	Capitalized Costs Of Oil And Gas Properties Employee Related Costs Incurred CapitalizedCostsOfOilAndGasPropertiesEmployeeRelatedCostsIncurred	10688000	USD
CY2016	lpi	Capitalized Costs Of Oil And Gas Properties Employee Related Costs Incurred CapitalizedCostsOfOilAndGasPropertiesEmployeeRelatedCostsIncurred	19222000	USD
CY2017	lpi	Capitalized Costs Of Oil And Gas Properties Employee Related Costs Incurred CapitalizedCostsOfOilAndGasPropertiesEmployeeRelatedCostsIncurred	25553000	USD
CY2015	lpi	Cash Settlements Of Matured Derivative Financial Instruments Net CashSettlementsOfMaturedDerivativeFinancialInstrumentsNet	255281000	USD
CY2016	lpi	Cash Settlements Of Matured Derivative Financial Instruments Net CashSettlementsOfMaturedDerivativeFinancialInstrumentsNet	195281000	USD
CY2017	lpi	Cash Settlements Of Matured Derivative Financial Instruments Net CashSettlementsOfMaturedDerivativeFinancialInstrumentsNet	37583000	USD
CY2015	lpi	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-86369000	USD
CY2016	lpi	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	-31027000	USD
CY2017	lpi	Change In Capital Expenditures Incurred But Not Yet Paid ChangeInCapitalExpendituresIncurredButNotYetPaid	51876000	USD
CY2015	lpi	Change In Net Present Value Of Deferred Premiums For Derivative Financial Instruments ChangeInNetPresentValueOfDeferredPremiumsForDerivativeFinancialInstruments	203000	USD
CY2016	lpi	Change In Net Present Value Of Deferred Premiums For Derivative Financial Instruments ChangeInNetPresentValueOfDeferredPremiumsForDerivativeFinancialInstruments	232000	USD
CY2017	lpi	Change In Net Present Value Of Deferred Premiums For Derivative Financial Instruments ChangeInNetPresentValueOfDeferredPremiumsForDerivativeFinancialInstruments	394000	USD
CY2016Q4	lpi	Debt Issuance Costs Including Line Of Credit Arrangements Net DebtIssuanceCostsIncludingLineOfCreditArrangementsNet	18800000	USD
CY2017Q4	lpi	Debt Issuance Costs Including Line Of Credit Arrangements Net DebtIssuanceCostsIncludingLineOfCreditArrangementsNet	14200000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense After Year Five DeferredFinanceCostsAmortizationExpenseAfterYearFive	134000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense Next Twelve Months DeferredFinanceCostsAmortizationExpenseNextTwelveMonths	3173000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense Year Five DeferredFinanceCostsAmortizationExpenseYearFive	1350000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense Year Four DeferredFinanceCostsAmortizationExpenseYearFour	3173000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense Year Three DeferredFinanceCostsAmortizationExpenseYearThree	3173000	USD
CY2017Q4	lpi	Deferred Finance Costs Amortization Expense Year Two DeferredFinanceCostsAmortizationExpenseYearTwo	3173000	USD
CY2016Q4	lpi	Deferred Gainon Saleof Property Noncurrent DeferredGainonSaleofPropertyNoncurrent	0	USD
CY2017Q4	lpi	Deferred Gainon Saleof Property Noncurrent DeferredGainonSaleofPropertyNoncurrent	120974000	USD
CY2017Q4	lpi	Deferred Tax Asset Alternative Minimum Tax Carryforward Refund Receivable In Year3 DeferredTaxAssetAlternativeMinimumTaxCarryforwardRefundReceivableInYear3	1257000	USD
CY2017Q4	lpi	Deferred Tax Asset Alternative Minimum Tax Carryforward Refund Receivable Next Two Years DeferredTaxAssetAlternativeMinimumTaxCarryforwardRefundReceivableNextTwoYears	2513000	USD
CY2017Q4	lpi	Deferred Tax Asset Alternative Minimum Tax Carryforward Refund Receivable Total DeferredTaxAssetAlternativeMinimumTaxCarryforwardRefundReceivableTotal	5026000	USD
CY2017Q4	lpi	Deferred Tax Asset Alternative Minimum Tax Carryforward Refund Receivable Year4 DeferredTaxAssetAlternativeMinimumTaxCarryforwardRefundReceivableYear4	628000	USD
CY2017Q4	lpi	Deferred Tax Asset Alternative Minimum Tax Carryforward Refund Receivable Year5 DeferredTaxAssetAlternativeMinimumTaxCarryforwardRefundReceivableYear5	628000	USD
CY2016Q4	lpi	Deferred Tax Assets Gain On Saleof Assets DeferredTaxAssetsGainOnSaleofAssets	0	USD
CY2017Q4	lpi	Deferred Tax Assets Gain On Saleof Assets DeferredTaxAssetsGainOnSaleofAssets	40177000	USD
CY2016Q4	lpi	Deferred Tax Assets Gross Net DeferredTaxAssetsGrossNet	764816000	USD
CY2017Q4	lpi	Deferred Tax Assets Gross Net DeferredTaxAssetsGrossNet	341402000	USD
CY2016Q4	lpi	Deferred Tax Assets Tax Deferred Expense Capitalized Interest DeferredTaxAssetsTaxDeferredExpenseCapitalizedInterest	1767000	USD
CY2017Q4	lpi	Deferred Tax Assets Tax Deferred Expense Capitalized Interest DeferredTaxAssetsTaxDeferredExpenseCapitalizedInterest	721000	USD
CY2015	lpi	Depletion Expense Per Physical Unit Of Production DepletionExpensePerPhysicalUnitOfProduction	16.13
CY2016	lpi	Depletion Expense Per Physical Unit Of Production DepletionExpensePerPhysicalUnitOfProduction	7.39
CY2017	lpi	Depletion Expense Per Physical Unit Of Production DepletionExpensePerPhysicalUnitOfProduction	6.75
CY2015	lpi	Deposit Receivedfor Potential Saleof Oiland Natural Gas Properties DepositReceivedforPotentialSaleofOilandNaturalGasProperties	0	USD
CY2016	lpi	Deposit Receivedfor Potential Saleof Oiland Natural Gas Properties DepositReceivedforPotentialSaleofOilandNaturalGasProperties	3000000	USD
CY2017	lpi	Deposit Receivedfor Potential Saleof Oiland Natural Gas Properties DepositReceivedforPotentialSaleofOilandNaturalGasProperties	0	USD
CY2015	lpi	Deposit Utilized For Saleof Oiland Natural Gas Properties DepositUtilizedForSaleofOilandNaturalGasProperties	0	USD
CY2016	lpi	Deposit Utilized For Saleof Oiland Natural Gas Properties DepositUtilizedForSaleofOilandNaturalGasProperties	0	USD
CY2017	lpi	Deposit Utilized For Saleof Oiland Natural Gas Properties DepositUtilizedForSaleofOilandNaturalGasProperties	3000000	USD
CY2017Q4	lpi	Derivative Financial Instrument Deferred Premium Future Payments Due DerivativeFinancialInstrumentDeferredPremiumFuturePaymentsDue	29344000	USD
CY2017Q4	lpi	Derivative Financial Instrument Deferred Premium Future Payments Due Due In Three Years DerivativeFinancialInstrumentDeferredPremiumFuturePaymentsDueDueInThreeYears	633000	USD
CY2017Q4	lpi	Derivative Financial Instrument Deferred Premium Future Payments Due Due In Two Years DerivativeFinancialInstrumentDeferredPremiumFuturePaymentsDueDueInTwoYears	8376000	USD
CY2017Q4	lpi	Derivative Financial Instrument Deferred Premium Future Payments Due Next Twelve Months DerivativeFinancialInstrumentDeferredPremiumFuturePaymentsDueNextTwelveMonths	20335000	USD
CY2016	lpi	Development Wells Scheduled To Be Drilled In The Next Twelve Months DevelopmentWellsScheduledToBeDrilledInTheNextTwelveMonths	7	location
CY2017	lpi	Development Wells Scheduled To Be Drilled In The Next Twelve Months DevelopmentWellsScheduledToBeDrilledInTheNextTwelveMonths	8	location
CY2017	lpi	Discount Rate Full Cost Ceiling DiscountRateFullCostCeiling	0.1
CY2015	lpi	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Tax Rate Amount EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsTaxRateAmount	0	USD
CY2016	lpi	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Tax Rate Amount EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsTaxRateAmount	0	USD
CY2017	lpi	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Tax Rate Amount EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsTaxRateAmount	226263000	USD
CY2015	lpi	Income Tax Reconciliation Tax Deficiency Share Based Compensation Cost IncomeTaxReconciliationTaxDeficiencyShareBasedCompensationCost	3274000	USD
CY2016	lpi	Income Tax Reconciliation Tax Deficiency Share Based Compensation Cost IncomeTaxReconciliationTaxDeficiencyShareBasedCompensationCost	4144000	USD
CY2017	lpi	Income Tax Reconciliation Tax Deficiency Share Based Compensation Cost IncomeTaxReconciliationTaxDeficiencyShareBasedCompensationCost	64000	USD
CY2015	lpi	Increase Decrease In Fair Value Of Performance Unit Awards IncreaseDecreaseInFairValueOfPerformanceUnitAwards	4081000	USD
CY2016	lpi	Increase Decrease In Fair Value Of Performance Unit Awards IncreaseDecreaseInFairValueOfPerformanceUnitAwards	0	USD
CY2017	lpi	Increase Decrease In Fair Value Of Performance Unit Awards IncreaseDecreaseInFairValueOfPerformanceUnitAwards	0	USD
CY2015	lpi	Increase Decrease In Investments With Affiliates IncreaseDecreaseInInvestmentsWithAffiliates	0	USD
CY2016	lpi	Increase Decrease In Investments With Affiliates IncreaseDecreaseInInvestmentsWithAffiliates	0	USD
CY2017	lpi	Increase Decrease In Investments With Affiliates IncreaseDecreaseInInvestmentsWithAffiliates	0	USD
CY2015	lpi	Increase Decrease In Undistributed Revenue And Accrued Royalties IncreaseDecreaseInUndistributedRevenueAndAccruedRoyalties	-30898000	USD
CY2016	lpi	Increase Decrease In Undistributed Revenue And Accrued Royalties IncreaseDecreaseInUndistributedRevenueAndAccruedRoyalties	-7735000	USD
CY2017	lpi	Increase Decrease In Undistributed Revenue And Accrued Royalties IncreaseDecreaseInUndistributedRevenueAndAccruedRoyalties	11014000	USD
CY2016Q4	lpi	Inventory And Linefill Assets InventoryAndLinefillAssets	8063000	USD
CY2017Q4	lpi	Inventory And Linefill Assets InventoryAndLinefillAssets	9148000	USD
CY2015	lpi	Jointly Owned Oil And Natural Gas Property Fees Received For Operation JointlyOwnedOilAndNaturalGasPropertyFeesReceivedForOperation	3125000	USD
CY2016	lpi	Jointly Owned Oil And Natural Gas Property Fees Received For Operation JointlyOwnedOilAndNaturalGasPropertyFeesReceivedForOperation	2477000	USD
CY2017	lpi	Jointly Owned Oil And Natural Gas Property Fees Received For Operation JointlyOwnedOilAndNaturalGasPropertyFeesReceivedForOperation	2549000	USD
CY2016Q4	lpi	Midstream Service Assets Net MidstreamServiceAssetsNet	126240000	USD
CY2017Q4	lpi	Midstream Service Assets Net MidstreamServiceAssetsNet	138325000	USD
CY2015	lpi	Midstream Service Costs MidstreamServiceCosts	5846000	USD
CY2016	lpi	Midstream Service Costs MidstreamServiceCosts	4077000	USD
CY2017	lpi	Midstream Service Costs MidstreamServiceCosts	4099000	USD
CY2015	lpi	Minimum Volume Commitments Deficiency Payments MinimumVolumeCommitmentsDeficiencyPayments	5200000	USD
CY2016	lpi	Minimum Volume Commitments Deficiency Payments MinimumVolumeCommitmentsDeficiencyPayments	2200000	USD
CY2017	lpi	Minimum Volume Commitments Deficiency Payments MinimumVolumeCommitmentsDeficiencyPayments	1100000	USD
CY2015	lpi	Number Of Locations In New Proved Undeveloped Locations NumberOfLocationsInNewProvedUndevelopedLocations	4	location
CY2015	lpi	Number Of Proved And Undeveloped Locations Removed NumberOfProvedAndUndevelopedLocationsRemoved	378	location
CY2015	lpi	Number Of Proved And Undeveloped Locations Removed Horizontal Wells NumberOfProvedAndUndevelopedLocationsRemovedHorizontalWells	196	location
CY2015	lpi	Number Of Proved And Undeveloped Locations Removed Wolfberry Wells NumberOfProvedAndUndevelopedLocationsRemovedWolfberryWells	182	location
CY2015	lpi	Number Of Proved Undeveloped Locations Redetermined NumberOfProvedUndevelopedLocationsRedetermined	34	location
CY2015	lpi	Number Of Reportable Reserves Streams NumberOfReportableReservesStreams	3	reserves_stream
CY2016	lpi	Number Of Reportable Reserves Streams NumberOfReportableReservesStreams	3	reserves_stream
CY2017	lpi	Number Of Reportable Reserves Streams NumberOfReportableReservesStreams	3	reserves_stream
CY2015	lpi	Oil And Gas Midstream Service Revenue OilAndGasMidstreamServiceRevenue	6548000	USD
CY2016	lpi	Oil And Gas Midstream Service Revenue OilAndGasMidstreamServiceRevenue	8342000	USD
CY2017	lpi	Oil And Gas Midstream Service Revenue OilAndGasMidstreamServiceRevenue	10517000	USD
CY2015	lpi	Oil And Gas Property Lease Operating Expense Including Productionand Ad Valorem Tax OilAndGasPropertyLeaseOperatingExpenseIncludingProductionandAdValoremTax	141233000	USD
CY2016	lpi	Oil And Gas Property Lease Operating Expense Including Productionand Ad Valorem Tax OilAndGasPropertyLeaseOperatingExpenseIncludingProductionandAdValoremTax	103913000	USD
CY2017	lpi	Oil And Gas Property Lease Operating Expense Including Productionand Ad Valorem Tax OilAndGasPropertyLeaseOperatingExpenseIncludingProductionandAdValoremTax	112851000	USD
CY2016Q4	lpi	Oil Gas Properties Lease Operating Expense Accrual OilGasPropertiesLeaseOperatingExpenseAccrual	10572000	USD
CY2017Q4	lpi	Oil Gas Properties Lease Operating Expense Accrual OilGasPropertiesLeaseOperatingExpenseAccrual	9034000	USD
CY2016Q4	lpi	Other Accrued Expenses Current OtherAccruedExpensesCurrent	9365000	USD
CY2017Q4	lpi	Other Accrued Expenses Current OtherAccruedExpensesCurrent	24493000	USD
CY2016Q4	lpi	Other Assets Current Not Separately Disclosed OtherAssetsCurrentNotSeparatelyDisclosed	67910000	USD
CY2017Q4	lpi	Other Assets Current Not Separately Disclosed OtherAssetsCurrentNotSeparatelyDisclosed	134737000	USD
CY2016Q4	lpi	Other Assets Noncurrent Not Separately Disclosed OtherAssetsNoncurrentNotSeparatelyDisclosed	16749000	USD
CY2017Q4	lpi	Other Assets Noncurrent Not Separately Disclosed OtherAssetsNoncurrentNotSeparatelyDisclosed	19522000	USD
CY2016Q4	lpi	Other Liabilities Current Not Separately Disclosed OtherLiabilitiesCurrentNotSeparatelyDisclosed	135741000	USD
CY2017Q4	lpi	Other Liabilities Current Not Separately Disclosed OtherLiabilitiesCurrentNotSeparatelyDisclosed	219078000	USD
CY2016Q4	lpi	Other Liabilities Noncurrent Not Separately Disclosed OtherLiabilitiesNoncurrentNotSeparatelyDisclosed	59919000	USD
CY2017Q4	lpi	Other Liabilities Noncurrent Not Separately Disclosed OtherLiabilitiesNoncurrentNotSeparatelyDisclosed	188436000	USD
CY2015	lpi	Payments For Proceeds From Capital Expenditures And Other Investing Activities PaymentsForProceedsFromCapitalExpendituresAndOtherInvestingActivities	-667507000	USD
CY2016	lpi	Payments For Proceeds From Capital Expenditures And Other Investing Activities PaymentsForProceedsFromCapitalExpendituresAndOtherInvestingActivities	-564402000	USD
CY2017	lpi	Payments For Proceeds From Capital Expenditures And Other Investing Activities PaymentsForProceedsFromCapitalExpendituresAndOtherInvestingActivities	-534565000	USD
CY2015	lpi	Payments To Acquire Midstream Service Assets PaymentsToAcquireMidstreamServiceAssets	35459000	USD
CY2016	lpi	Payments To Acquire Midstream Service Assets PaymentsToAcquireMidstreamServiceAssets	5240000	USD
CY2017	lpi	Payments To Acquire Midstream Service Assets PaymentsToAcquireMidstreamServiceAssets	20887000	USD
CY2015	lpi	Percentage Of Proved Reserves Estimated By Independent Reserve Engineers PercentageOfProvedReservesEstimatedByIndependentReserveEngineers	1
CY2016	lpi	Percentage Of Proved Reserves Estimated By Independent Reserve Engineers PercentageOfProvedReservesEstimatedByIndependentReserveEngineers	1
CY2017	lpi	Percentage Of Proved Reserves Estimated By Independent Reserve Engineers PercentageOfProvedReservesEstimatedByIndependentReserveEngineers	1
CY2015	lpi	Premiums Paid Received For Derivative Financial Instruments PremiumsPaidReceivedForDerivativeFinancialInstruments	5167000	USD
CY2016	lpi	Premiums Paid Received For Derivative Financial Instruments PremiumsPaidReceivedForDerivativeFinancialInstruments	89669000	USD
CY2017	lpi	Premiums Paid Received For Derivative Financial Instruments PremiumsPaidReceivedForDerivativeFinancialInstruments	25853000	USD
CY2015	lpi	Proceeds From Payments For Cash Settlements Early Terminations Of Derivative Financial Instruments Net ProceedsFromPaymentsForCashSettlementsEarlyTerminationsOfDerivativeFinancialInstrumentsNet	0	USD
CY2016	lpi	Proceeds From Payments For Cash Settlements Early Terminations Of Derivative Financial Instruments Net ProceedsFromPaymentsForCashSettlementsEarlyTerminationsOfDerivativeFinancialInstrumentsNet	80000000	USD
CY2017	lpi	Proceeds From Payments For Cash Settlements Early Terminations Of Derivative Financial Instruments Net ProceedsFromPaymentsForCashSettlementsEarlyTerminationsOfDerivativeFinancialInstrumentsNet	4234000	USD
CY2015Q4	lpi	Property Plant And Equipment Including Equity Method Investments Gross PropertyPlantAndEquipmentIncludingEquityMethodInvestmentsGross	5645976000	USD
CY2016Q4	lpi	Property Plant And Equipment Including Equity Method Investments Gross PropertyPlantAndEquipmentIncludingEquityMethodInvestmentsGross	6172024000	USD
CY2017Q4	lpi	Property Plant And Equipment Including Equity Method Investments Gross PropertyPlantAndEquipmentIncludingEquityMethodInvestmentsGross	6482103000	USD
CY2015	lpi	Restructuring Charges And Other Cost And Expense Operating RestructuringChargesAndOtherCostAndExpenseOperating	13700000	USD
CY2016	lpi	Restructuring Charges And Other Cost And Expense Operating RestructuringChargesAndOtherCostAndExpenseOperating	5692000	USD
CY2017	lpi	Restructuring Charges And Other Cost And Expense Operating RestructuringChargesAndOtherCostAndExpenseOperating	4931000	USD
CY2017	lpi	Share Based Compensation Arrangement By Share Based Payment Award Number Of Anniversaries For Vesting ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAnniversariesForVesting	4	anniversaries
CY2017	lpi	Share Based Compensation Arrangement By Share Based Payment Award Number Of Installments For Vesting ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfInstallmentsForVesting	4	installment
CY2015	lpi	Unamortized Costs Capitalized Before Related Deferred Income Taxes Exceed Ceiling Limitations Expense UnamortizedCostsCapitalizedBeforeRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpense	2400000000	USD
CY2016	lpi	Unamortized Costs Capitalized Before Related Deferred Income Taxes Exceed Ceiling Limitations Expense UnamortizedCostsCapitalizedBeforeRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpense	161100000	USD
CY2017	lpi	Unamortized Costs Capitalized Before Related Deferred Income Taxes Exceed Ceiling Limitations Expense UnamortizedCostsCapitalizedBeforeRelatedDeferredIncomeTaxesExceedCeilingLimitationsExpense	0	USD
CY2016Q4	lpi	Undistributed Revenue And Accrued Royalties Current UndistributedRevenueAndAccruedRoyaltiesCurrent	26838000	USD
CY2017Q4	lpi	Undistributed Revenue And Accrued Royalties Current UndistributedRevenueAndAccruedRoyaltiesCurrent	37852000	USD
CY2017Q4	lpi	Unrestrictedand Unencumbered Cashand Cash Equivalents Maximum UnrestrictedandUnencumberedCashandCashEquivalentsMaximum	50000000	USD
CY2016Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	52204000	USD
CY2017Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	58341000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	52204000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	58341000	USD
CY2016Q4	us-gaap	Accounts Payable Trade Current And Noncurrent AccountsPayableTradeCurrentAndNoncurrent	15054000	USD
CY2017Q4	us-gaap	Accounts Payable Trade Current And Noncurrent AccountsPayableTradeCurrentAndNoncurrent	5730000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	86867000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	100645000	USD
CY2016Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	0	USD
CY2017Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	0	USD
CY2016Q4	us-gaap	Accumulated Amortization Of Noncurrent Deferred Finance Costs AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts	21300000	USD
CY2017Q4	us-gaap	Accumulated Amortization Of Noncurrent Deferred Finance Costs AccumulatedAmortizationOfNoncurrentDeferredFinanceCosts	20800000	USD
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2396236000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	2432262000	USD
CY2015	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	2811000	USD
CY2016	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	1635000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	7662000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	26830000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	35240000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	43297000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	24509000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	29229000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	35734000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	200000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	100000	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4727000	USD
CY2016	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4279000	USD
CY2017	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4086000	USD
CY2015	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2374888000	USD
CY2016	us-gaap	Asset Impairment Charges AssetImpairmentCharges	162027000	USD
CY2017	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	46306000	USD
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	52207000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	55506000	USD
CY2016	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3483000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	3791000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1528000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	616000	USD
CY2016	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	0	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	871000	USD
CY2016	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	2132000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	171000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	50604000	USD
CY2017Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	53962000	USD
CY2016Q4	us-gaap	Assets Assets	1782346000	USD
CY2017Q4	us-gaap	Assets Assets	2023289000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	154777000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	235382000	USD
CY2015Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	4218942000	USD
CY2016Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	4514183000	USD
CY2017Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	4657466000	USD
CY2014	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	51183000	USD
CY2015	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	324000	USD
CY2016	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	93099000	USD
CY2017	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	31259000	USD
CY2015Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	140299000	USD
CY2016Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	221281000	USD
CY2017Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	175865000	USD
CY2015Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	5243934000	USD
CY2016Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	5710037000	USD
CY2017Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	6246805000	USD
CY2015Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1024992000	USD
CY2016Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1195854000	USD
CY2017Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	1589339000	USD
CY2015Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	5103635000	USD
CY2016Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	5488756000	USD
CY2017Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	6070940000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	29321000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	31154000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	32672000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	112159000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1833000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1518000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	79487000	USD
CY2017Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	117800000	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	241929070	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	242521143	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	241929070	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	242521143	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	2419000	USD
CY2017	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	195908000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	2425000	USD
CY2015	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	174338000	USD
CY2016	us-gaap	Cost Of Purchased Oil And Gas CostOfPurchasedOilAndGas	169536000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	3078154000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	685340000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	572490000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	0	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	5905000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties With Proved Reserves CostsIncurredAcquisitionOfOilAndGasPropertiesWithProvedReserves	0	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	0	USD
CY2016	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	119923000	USD
CY2017	us-gaap	Costs Incurred Acquisition Of Unproved Oil And Gas Properties CostsIncurredAcquisitionOfUnprovedOilAndGasProperties	0	USD
CY2015	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	500577000	USD
CY2016	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	298942000	USD
CY2017	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	560919000	USD
CY2015	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	20697000	USD
CY2016	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	41333000	USD
CY2017	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	36257000	USD
CY2015	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	521274000	USD
CY2016	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	466103000	USD
CY2017	us-gaap	Costs Incurred Oil And Gas Property Acquisition Exploration And Development Activities CostsIncurredOilAndGasPropertyAcquisitionExplorationAndDevelopmentActivities	597176000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1800000	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	1800000	USD
CY2016Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1370000000	USD
CY2017Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	800000000	USD
CY2015	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	29149000	USD
CY2016	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	0	USD
CY2017	us-gaap	Decrease Due To Sales Of Minerals In Place DecreaseDueToSalesOfMineralsInPlace	793000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-152590000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
CY2016Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	16091000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	8145000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Noncurrent Net DeferredFinanceCostsNoncurrentNet	14176000	USD
CY2016Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	0	USD
CY2017Q4	us-gaap	Deferred Gain On Sale Of Property DeferredGainOnSaleOfProperty	20144000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-176945000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	0	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-24355000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2016Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	150000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	3788000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	1982000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Impairment Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses	1206000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	764800000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	764816000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	341402000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	0	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	573521000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	355100000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	743000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	2195000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	186473000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	5000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	8834000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	4343000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	15639000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	14025000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	24293000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	80153000	USD
CY2015	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	263700000	USD
CY2016	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	134100000	USD
CY2017	us-gaap	Depletion Of Oil And Gas Properties DepletionOfOilAndGasProperties	143600000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	277724000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	148339000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	158389000	USD
CY2016Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	20947000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	6892000	USD
CY2016Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	8718000	USD
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	3413000	USD
CY2016Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	20993000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	22950000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	5694000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	384000	USD
CY2016	us-gaap	Development Wells Drilled Net Productive DevelopmentWellsDrilledNetProductive	4	location
CY2017	us-gaap	Development Wells Drilled Net Productive DevelopmentWellsDrilledNetProductive	10	location
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.85
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.33
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.04
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.08
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.05
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.85
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.33
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.08
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.07
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.05
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.00
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.00
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	1571012000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	2019693000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	3556854000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	376701000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	290505000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	307689000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	0	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	237153000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	1321471000	USD
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	25947000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	21287000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2321000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	6011000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	7563000	USD
CY2015	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2016	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	0	USD
CY2017	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	405906000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	243953000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	0	USD
CY2015	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	192979000	USD
CY2016	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	133472000	USD
CY2017	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	296129000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	3269184000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	3548567000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	5777533000	USD
CY2016Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	1238369000	USD
CY2017Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	1675837000	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	740265000	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	1041199000	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	1786533000	USD
CY2015	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	214291000	USD
CY2016	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-87425000	USD
CY2017	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	350000	USD
CY2015	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-2127000	USD
CY2016	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-790000	USD
CY2017	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-1306000	USD
CY2015	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-31537000	USD
CY2016	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-23761000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	90425000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	91756000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	96312000	USD
CY2015	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	2369477000	USD
CY2016	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	161064000	USD
CY2017	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-2386881000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-260739000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	550774000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-11.10
CY2016	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-1.16
CY2017	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.30
CY2015	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-11.10
CY2016	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-1.16
CY2017	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.29
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	6799000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	9403000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8485000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-176945000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1800000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	668702000	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	86569000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-417518000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-835408000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-91259000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	192141000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	256000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	206000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	176000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1546000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-13975000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	370000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-696000	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	5500000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-38881000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	5432000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	9137000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-38975000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-832000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	12124000	USD
CY2015	us-gaap	Increase Decrease In Due To Related Parties Current IncreaseDecreaseInDueToRelatedPartiesCurrent	27583000	USD
CY2016	us-gaap	Increase Decrease In Due To Related Parties Current IncreaseDecreaseInDueToRelatedPartiesCurrent	-27583000	USD
CY2017	us-gaap	Increase Decrease In Due To Related Parties Current IncreaseDecreaseInDueToRelatedPartiesCurrent	0	USD
CY2015	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	-2974000	USD
CY2016	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	22153000	USD
CY2017	us-gaap	Increase Decrease In Estimated Future Development Costs IncreaseDecreaseInEstimatedFutureDevelopmentCosts	10989000	USD
CY2016	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	0	USD
CY2015	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	997805000	USD
CY2015	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-13481000	USD
CY2016	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	89726000	USD
CY2017	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	92700000	USD
CY2015	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	236000	USD
CY2016	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	294000	USD
CY2016	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-56000	USD
CY2017	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-6139000	USD
CY2015	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	2309000	USD
CY2016	us-gaap	Interest Costs Incurred InterestCostsIncurred	93592000	USD
CY2017	us-gaap	Interest Costs Incurred InterestCostsIncurred	90529000	USD
CY2017	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-46610000	USD
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	1013000	USD
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3132000	USD
CY2015	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-12942000	USD
CY2016	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	13153000	USD
CY2017	us-gaap	Increase Decrease In Other Current Liabilities IncreaseDecreaseInOtherCurrentLiabilities	-2327000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	0	USD
CY2015	us-gaap	Interest Expense InterestExpense	103219000	USD
CY2016	us-gaap	Interest Expense InterestExpense	93298000	USD
CY2017	us-gaap	Interest Expense InterestExpense	89377000	USD
CY2015	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	112693000	USD
CY2016	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	0	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets IncreaseDecreaseInOtherNoncurrentAssets	5103000	USD
CY2015	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	119000	USD
CY2016	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	-419000	USD
CY2017	us-gaap	Increase Decrease In Other Noncurrent Liabilities IncreaseDecreaseInOtherNoncurrentLiabilities	8821000	USD
CY2015	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2016	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	3422000	USD
CY2017	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2015	us-gaap	Interest And Other Income InterestAndOtherIncome	426000	USD
CY2016	us-gaap	Interest And Other Income InterestAndOtherIncome	175000	USD
CY2017	us-gaap	Interest And Other Income InterestAndOtherIncome	805000	USD
CY2015	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	236000	USD
CY2016	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	294000	USD
CY2017	us-gaap	Interest Costs Capitalized Adjustment InterestCostsCapitalizedAdjustment	1152000	USD
CY2015	us-gaap	Interest Costs Incurred InterestCostsIncurred	103455000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	1152000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	112457000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	89432000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	91548000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	24152000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	18013000	USD
CY2016Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	243953000	USD
CY2017Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2015	us-gaap	Lease Operating Expense LeaseOperatingExpense	108341000	USD
CY2016	us-gaap	Lease Operating Expense LeaseOperatingExpense	75327000	USD
CY2017	us-gaap	Lease Operating Expense LeaseOperatingExpense	75049000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	1601773000	USD
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	61110000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	11027000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	408561000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	548974000	USD
CY2015	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-1495144000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	1257710000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1782346000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2023289000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	187945000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	277419000	USD
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	1353909000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	791855000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1353909000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	791855000	USD
CY2017Q4	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	17100000	USD
CY2017Q4	us-gaap	Loss Contingency New Claims Filed Number LossContingencyNewClaimsFiledNumber	9	Claim
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	353393000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	209625000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-600477000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-667507000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-564402000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	295050000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	315947000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	356295000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	384914000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-2209936000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-180371000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	-71432000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	9485000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	-18421000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	-260739000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	68276000	USD
CY2016	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	-80102000	USD
CY2017	us-gaap	Net Increase Decrease In Sales And Transfer Prices And Production Costs NetIncreaseDecreaseInSalesAndTransferPricesAndProductionCosts	474831000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	84633000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-172777000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	301102000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	1826000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	2031000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	3255000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	5802000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2880000	USD
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2664000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2696000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	6966000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	16111000	USD
CY2016Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	3621000	USD
CY2017Q4	us-gaap	Other Accrued Liabilities Noncurrent OtherAccruedLiabilitiesNoncurrent	13116000	USD
CY2016Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	12175000	USD
CY2017Q4	us-gaap	Oil And Gas Joint Interest Billing Receivables Current OilAndGasJointInterestBillingReceivablesCurrent	8780000	USD
CY2016Q4	us-gaap	Oil And Gas Property Full Cost Method Net OilAndGasPropertyFullCostMethodNet	1195854000	USD
CY2017Q4	us-gaap	Oil And Gas Property Full Cost Method Net OilAndGasPropertyFullCostMethodNet	1589339000	USD
CY2016Q4	us-gaap	Oil And Gas Sales Payable Current And Noncurrent OilAndGasSalesPayableCurrentAndNoncurrent	17213000	USD
CY2017Q4	us-gaap	Oil And Gas Sales Payable Current And Noncurrent OilAndGasSalesPayableCurrentAndNoncurrent	19084000	USD
CY2015	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	431734000	USD
CY2016	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	426485000	USD
CY2017	us-gaap	Oil And Gas Sales Revenue OilAndGasSalesRevenue	621507000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	-2471514000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	-176788000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	17874000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	25492000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	45460000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	-87962000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	51326000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	52061000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	60452000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	85833000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	249672000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	17311000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	3177000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	2400000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	1220000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	14291000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	15686000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	8031000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	16109000	USD
CY2015	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	7658000	USD
CY2016	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	5692000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	4931000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	57065000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	75555000	USD
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	632601000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	373530000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	563914000	USD
CY2015	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	588017000	USD
CY2016	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	360679000	USD
CY2017	us-gaap	Payments To Explore And Develop Oil And Gas Properties PaymentsToExploreAndDevelopOilAndGasProperties	538122000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	3621000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	134090000	USD
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	187852000	USD
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-79479000	USD
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-15427000	USD
CY2015	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	4554000	USD
CY2016	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	4596000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	6067000	USD
CY2016Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	421000	USD
CY2017Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	4604000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2811000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1635000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7662000	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6759000	USD
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	4732000	USD
CY2015	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2016	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	124660000	USD
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	0	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	99855000	USD
CY2016	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	69609000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	31808000	USD
CY2015	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	9125000	USD
CY2016	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	7611000	USD
CY2017	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	4905000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	6228000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	6538000	USD
CY2015	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	162237000	USD
CY2016	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	189085000	USD
CY2017	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	192332000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	754163000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1768385000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	44773000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Other Net PropertyPlantAndEquipmentOtherNet	40721000	USD
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	22388000	Boe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	16346000	Boe
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	276052000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	350000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2015	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	310000000	USD
CY2016	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	239682000	USD
CY2017	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	190000000	USD
CY2015	us-gaap	Proceeds From Rents Received ProceedsFromRentsReceived	0	USD
CY2016	us-gaap	Proceeds From Rents Received ProceedsFromRentsReceived	0	USD
CY2015	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2016	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2017	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	829615000	USD
CY2015	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	64949000	USD
CY2016	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	397000	USD
CY2017	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	64157000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	0	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	208000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	397000	USD
CY2015	us-gaap	Production Tax Expense ProductionTaxExpense	32892000	USD
CY2016	us-gaap	Production Tax Expense ProductionTaxExpense	28586000	USD
CY2017	us-gaap	Production Tax Expense ProductionTaxExpense	37802000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	1366867000	USD
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	24940000	Boe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Extension And Discovery Energy ProvedDevelopedAndUndevelopedReserveExtensionAndDiscoveryEnergy	34921000	Boe
CY2014Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	247322000	Boe
CY2015Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	125698000	Boe
CY2016Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	167100000	Boe
CY2017Q4	us-gaap	Proved Developed And Undeveloped Reserve Net Energy ProvedDevelopedAndUndevelopedReserveNetEnergy	215883000	Boe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	18149000	Boe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Production Energy ProvedDevelopedAndUndevelopedReserveProductionEnergy	21270000	Boe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Purchase Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy	529000	Boe
CY2015	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	-124180000	Boe
CY2016	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	34082000	Boe
CY2017	us-gaap	Proved Developed And Undeveloped Reserve Revision Of Previous Estimate Energy ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy	35351000	Boe
CY2015	us-gaap	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	3486000	Boe
CY2017	us-gaap	Proved Developed And Undeveloped Reserves Sale Of Mineral In Place Energy ProvedDevelopedAndUndevelopedReservesSaleOfMineralInPlaceEnergy	218000	Boe
CY2014Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	105557000	Boe
CY2015Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	100395000	Boe
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	0	USD
CY2015Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	25303000	Boe
CY2016Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	141155000	Boe
CY2017Q4	us-gaap	Proved Developed Reserves Boe1 ProvedDevelopedReservesBOE1	191309000	Boe
CY2014Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	141765000	Boe
CY2016Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	25945000	Boe
CY2017Q4	us-gaap	Proved Undeveloped Reserve Boe1 ProvedUndevelopedReserveBOE1	24574000	Boe
CY2015	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	255000	USD
CY2015	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	475000000	USD
CY2016	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	304682000	USD
CY2017	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	260000000	USD
CY2015	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	576200000	USD
CY2016	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	0	USD
CY2017	us-gaap	Repayments Of Senior Debt RepaymentsOfSeniorDebt	518480000	USD
CY2015	us-gaap	Restructuring Charges RestructuringCharges	6042000	USD
CY2016	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	0	USD
CY2015	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	2236000	USD
CY2016	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	3274000	USD
CY2017	us-gaap	Results Of Operations Accretion Of Asset Retirement Obligations ResultsOfOperationsAccretionOfAssetRetirementObligations	3567000	USD
CY2015	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	263666000	USD
CY2016	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	134105000	USD
CY2017	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	143592000	USD
CY2015	us-gaap	Results Of Operations Expense Other ResultsOfOperationsExpenseOther	2471238000	USD
CY2016	us-gaap	Results Of Operations Expense Other ResultsOfOperationsExpenseOther	298443000	USD
CY2017	us-gaap	Results Of Operations Expense Other ResultsOfOperationsExpenseOther	147159000	USD
CY2015	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-164141000	USD
CY2016	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	0	USD
CY2017	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	0	USD
CY2015	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-2180737000	USD
CY2016	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	24129000	USD
CY2017	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	361497000	USD
CY2015	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	141233000	USD
CY2016	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	103913000	USD
CY2017	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	112851000	USD
CY2015	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	431734000	USD
CY2016	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	426485000	USD
CY2017	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	621507000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-2218082000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-1669108000	USD
CY2015	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	168358000	USD
CY2016	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	162551000	USD
CY2017	us-gaap	Revenue From Purchased Oil And Gas RevenueFromPurchasedOilAndGas	190138000	USD
CY2015	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-2444322000	USD
CY2016	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	179297000	USD
CY2017	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	289150000	USD
CY2015	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	290501000	USD
CY2016	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	322573000	USD
CY2017	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	508656000	USD
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	606640000	USD
CY2016Q1	us-gaap	Sales Revenue Net SalesRevenueNet	106557000	USD
CY2016Q2	us-gaap	Sales Revenue Net SalesRevenueNet	146773000	USD
CY2016Q3	us-gaap	Sales Revenue Net SalesRevenueNet	159734000	USD
CY2016Q4	us-gaap	Sales Revenue Net SalesRevenueNet	184314000	USD
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	199158000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	225512000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	239096000	shares
CY2015	us-gaap	Well Service Expense WellServiceExpense	0	USD
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	597378000	USD
CY2017Q1	us-gaap	Sales Revenue Net SalesRevenueNet	189006000	USD
CY2017Q2	us-gaap	Sales Revenue Net SalesRevenueNet	187001000	USD
CY2017Q3	us-gaap	Sales Revenue Net SalesRevenueNet	205818000	USD
CY2017Q4	us-gaap	Sales Revenue Net SalesRevenueNet	240337000	USD
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	822162000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	24509000	USD
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	29229000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	35734000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid	2738000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid	6394000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid	0	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	68635000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-60082000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Other StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesOther	-13394000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	424453000	USD
CY2016	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	83075000	USD
CY2017	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Relating To Proved Oil And Gas Reserves Accretion Of Discount StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount	97849000	USD
CY2014Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	3246728000	USD
CY2015Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	830747000	USD
CY2016Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	978494000	USD
CY2017Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1770321000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	754163000	USD
CY2016	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	276052000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	208000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	397000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	1563201000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	131447000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	180573000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	765579000	USD
CY2017	us-gaap	Threshold Period Past Due For Writeoff Of Trade Accounts Receivable ThresholdPeriodPastDueForWriteoffOfTradeAccountsReceivable	P90D
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2016Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	-226000000	USD
CY2017Q4	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	423400000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	199158000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	225512000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	240122000	shares
CY2016	us-gaap	Well Service Expense WellServiceExpense	0	USD
CY2017	us-gaap	Well Service Expense WellServiceExpense	0	USD
CY2015	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2016	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	842000	USD
CY2017	us-gaap	Write Off Of Deferred Debt Issuance Cost WriteOffOfDeferredDebtIssuanceCost	0	USD
CY2017	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Credit risk</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company's oil, NGL and natural gas sales are made to a variety of purchasers, including intrastate and interstate pipelines or their marketing affiliates and independent marketing companies. The Company's joint operations accounts receivable are from a number of oil and natural gas companies, partnerships, individuals and others who own interests in the oil and natural gas properties operated by the Company. The Company's sales of purchased oil are generally made to </font><font style="font-family:inherit;font-size:10pt;">one</font><font style="font-family:inherit;font-size:10pt;"> customer. Management believes that any credit risk imposed by a concentration in the oil and natural gas industry is offset by the creditworthiness of the Company's customer base and industry partners. The Company routinely assesses the recoverability of all material trade and other receivables to determine collectability.</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company uses derivatives to hedge its exposure to oil, NGL and natural gas price volatility. These transactions expose the Company to potential credit risk from its counterparties. In accordance with the Company's standard practice, its derivatives are subject to counterparty netting under agreements governing such derivatives; therefore, the credit risk associated with its derivative counterparties is somewhat mitigated.</font></div></div>
CY2017	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Organization</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Laredo Petroleum, Inc. ("Laredo"), together with its wholly-owned subsidiaries, Laredo Midstream Services, LLC ("LMS") and Garden City Minerals, LLC ("GCM"), is an independent energy company focused on the acquisition, exploration and development of oil and natural gas properties, and the transportation of oil and natural gas from such properties, primarily in the Permian Basin in West Texas. LMS and GCM (together, the "Guarantors") guarantee all of Laredo's debt instruments. In these notes, the "Company" refers to Laredo, LMS and GCM collectively, unless the context indicates otherwise. All amounts, dollars and percentages presented in these consolidated financial statements and the related notes are rounded and therefore approximate. </font></div><div style="line-height:120%;padding-top:10px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company operates in </font><font style="font-family:inherit;font-size:10pt;">two</font><font style="font-family:inherit;font-size:10pt;"> business segments: (i) exploration and production and (ii) midstream and marketing. The exploration and production segment is engaged in the acquisition, exploration and development of oil and natural gas properties. The midstream and marketing segment provides Laredo's exploration and production segment and third parties with products and services that need to be delivered by midstream infrastructure, including oil and liquids-rich natural gas gathering services as well as rig fuel, natural gas lift and water delivery and takeaway.</font></div></div>
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:10px;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Reclassifications</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain amounts in the accompanying consolidated financial statements have been reclassified to conform to the </font><font style="font-family:inherit;font-size:10pt;">2017</font><font style="font-family:inherit;font-size:10pt;"> presentation. These reclassifications had no impact on previously reported total assets, total liabilities, net income (loss), stockholders' equity or total operating, investing or financing cash flows. </font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;font-size:10pt;"></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-bottom:10px;padding-top:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;"></font><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of estimates in the preparation of consolidated financial statements</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes these estimates are reasonable, actual results could differ.</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Significant estimates include, but are not limited to, (i) volumes of the Company's reserves of oil, natural gas liquids ("NGL") and natural gas, (ii) future cash flows from oil and natural gas properties, (iii) depletion, depreciation and amortization, (iv) impairments, (v) asset retirement obligations, (vi) stock-based compensation, (vii) deferred income taxes, (viii) deferred gain on sale of equity method investment, (ix) fair value of assets acquired and liabilities assumed in an acquisition, (x) fair values of derivatives and deferred premiums and (xi) contingent liabilities. As fair value is a market-based measurement, it is determined based on the assumptions that would be used by market participants. These estimates and assumptions are based on management's best judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment. Such estimates and assumptions are adjusted when facts and circumstances dictate. Illiquid credit markets and volatile equity and energy markets have combined to increase the uncertainty inherent in such estimates and assumptions. Management believes its estimates and assumptions to be reasonable under the circumstances. As future events and their effects cannot be determined with precision, actual values and results could differ from these estimates. Any changes in estimates resulting from future changes in the economic environment will be reflected in the financial statements in future periods.</font></div><div style="line-height:120%;padding-bottom:10px;padding-top:10px;font-size:10pt;"></div></div>

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$VTLE
Vital Energy, Inc. Stock $vtle

2017 Q4 Form 10-K Financial Statement

#000152812918000026 Filed on February 15, 2018

Income Statement

Balance Sheet

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$VTLE Vital Energy, Inc. Stock $vtle

2017 Q4 Form 10-K Financial Statement

#000152812918000026 Filed on February 15, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$VTLE
Vital Energy, Inc. Stock $vtle