$GPOR
GULFPORT ENERGY CORP Stock $gpor

$gpor Overview Financials Valuation SEC Filings Company Website

2014 Q4 Form 10-K Financial Statement

#000162828016011417 Filed on February 19, 2016

Income Statement

Concept	2014 Q4	2014 Q3	2014 Q2
Revenue	$267.7M	$170.8M	$114.7M
YoY Change	293.28%	146.64%	62.9%
Cost Of Revenue	$21.20M	$17.10M	$19.30M
YoY Change	42.28%	18.75%	35.92%
Gross Profit	$246.5M	$153.7M	$95.50M
YoY Change	363.35%	179.96%	69.93%
Gross Profit Margin	92.08%	89.99%	83.23%
Selling, General & Admin	$36.70M	$27.70M	$21.20M
YoY Change	182.31%	211.24%	332.65%
% of Gross Profit	14.89%	18.02%	22.2%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$80.10M	$72.41M	$55.99M
YoY Change	115.9%	135.93%	96.19%
% of Gross Profit	32.49%	47.11%	58.63%
Operating Expenses	$117.0M	$117.4M	$96.63M
YoY Change	132.6%	116.85%	101.4%
Operating Profit	$129.5M	$53.45M	$18.11M
YoY Change	4324.4%	253.13%	-19.35%
Interest Expense	$48.40M	$5.706M	$2.402M
YoY Change	14.15%	119.29%	-26.86%
% of Operating Profit	37.39%	10.67%	13.26%
Other Income/Expense, Net		-$41.66M	$61.20M
YoY Change		-185.38%	30.54%
Pretax Income	$177.8M	$11.80M	$79.31M
YoY Change	292.49%	-81.55%	14.38%
Income Tax	$67.76M	$4.876M	$31.46M
% Of Pretax Income	38.11%	41.34%	39.67%
Net Earnings	$110.1M	$6.920M	$47.85M
YoY Change	353.39%	-82.92%	9.18%
Net Earnings / Revenue	41.12%	4.05%	41.71%
Basic Earnings Per Share	$1.29	$0.08	$0.56
Diluted Earnings Per Share	$1.28	$0.08	$0.56
COMMON SHARES
Basic Shares Outstanding	85.53M shares	85.51M shares	85.45M shares
Diluted Shares Outstanding		85.91M shares	85.81M shares

Balance Sheet

Concept	2014 Q4	2014 Q3	2014 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$142.3M	$152.9M	$75.30M
YoY Change	-69.0%	60.1%	-64.88%
Cash & Equivalents	$142.3M	$152.9M	$75.29M
Short-Term Investments
Other Short-Term Assets	$82.10M	$17.20M	$11.30M
YoY Change	729.29%	145.71%	197.37%
Inventory
Prepaid Expenses
Receivables	$103.9M	$139.6M	$107.5M
Other Receivables	$0.00	$900.0K	$900.0K
Total Short-Term Assets	$328.3M	$310.7M	$195.0M
YoY Change	-38.18%	71.76%	-31.79%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.891B	$2.633B	$2.317B
YoY Change	69.68%	73.67%	70.6%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$369.6M	$373.2M	$501.4M
YoY Change	-16.02%	-25.46%	14.26%
Other Assets	$6.476M	$23.43M	$17.99M
YoY Change	-63.72%	82.66%	36.74%
Total Long-Term Assets	$3.291B	$3.031B	$2.837B
YoY Change	52.22%	49.32%	56.73%
TOTAL ASSETS
Total Short-Term Assets	$328.3M	$310.7M	$195.0M
Total Long-Term Assets	$3.291B	$3.031B	$2.837B
Total Assets	$3.619B	$3.341B	$3.032B
YoY Change	34.4%	51.16%	44.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$371.4M	$358.1M	$287.5M
YoY Change	94.76%	99.61%	101.9%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$168.0K	$166.0K	$163.0K
YoY Change	5.66%	6.41%	5.84%
Total Short-Term Liabilities	$398.7M	$362.2M	$312.9M
YoY Change	95.51%	95.68%	115.61%
LONG-TERM LIABILITIES
Long-Term Debt	$703.4M	$616.9M	$339.1M
YoY Change	135.23%	106.32%	13.43%
Other Long-Term Liabilities	$17.90M	$19.10M	$20.70M
YoY Change
Total Long-Term Liabilities	$703.4M	$616.9M	$339.1M
YoY Change	135.23%	106.32%	13.43%
TOTAL LIABILITIES
Total Short-Term Liabilities	$398.7M	$362.2M	$312.9M
Total Long-Term Liabilities	$703.4M	$616.9M	$339.1M
Total Liabilities	$1.323B	$1.152B	$843.3M
YoY Change	105.81%	94.25%	60.15%
SHAREHOLDERS EQUITY
Retained Earnings	$493.5M	$383.4M	$376.5M
YoY Change	100.53%	72.85%	107.67%
Common Stock	$856.0K	$854.0K	$854.0K
YoY Change	0.59%	10.19%	10.19%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$2.296B	$2.189B	$2.188B
YoY Change
Total Liabilities & Shareholders Equity	$3.619B	$3.341B	$3.032B
YoY Change	34.4%	51.16%	44.66%

Cashflow Statement

Concept	2014 Q4	2014 Q3	2014 Q2
OPERATING ACTIVITIES
Net Income	$110.1M	$6.920M	$47.85M
YoY Change	353.39%	-82.92%	9.18%
Depreciation, Depletion And Amortization	$80.10M	$72.41M	$55.99M
YoY Change	115.9%	135.93%	96.19%
Cash From Operating Activities	$124.0M	$84.40M	$45.30M
YoY Change	147.5%	25.04%	17.66%
INVESTING ACTIVITIES
Capital Expenditures	-$291.8M	-$369.8M	-$253.3M
YoY Change	45.39%	104.08%	134.97%
Acquisitions
YoY Change
Other Investing Activities	$59.20M	$90.50M	$73.70M
YoY Change	-44.83%	-1840.38%	30.21%
Cash From Investing Activities	-$232.7M	-$279.2M	-$179.7M
YoY Change	148.88%	49.87%	250.29%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	98.10M	272.5M	39.20M
YoY Change	-75.89%	-272600.0%	3166.67%
NET CHANGE
Cash From Operating Activities	124.0M	84.40M	45.30M
Cash From Investing Activities	-232.7M	-279.2M	-179.7M
Cash From Financing Activities	98.10M	272.5M	39.20M
Net Change In Cash	-10.60M	77.70M	-95.20M
YoY Change	-102.92%	-165.35%	720.69%
FREE CASH FLOW
Cash From Operating Activities	$124.0M	$84.40M	$45.30M
Capital Expenditures	-$291.8M	-$369.8M	-$253.3M
Free Cash Flow	$415.8M	$454.2M	$298.6M
YoY Change	65.79%	82.63%	104.1%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2015	dei	Entity Central Index Key EntityCentralIndexKey	0000874499
CY2015	dei	Amendment Flag AmendmentFlag	false
CY2015	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2015	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2015	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2015
CY2015	dei	Document Period End Date DocumentPeriodEndDate	2015-12-31
CY2015	dei	Document Type DocumentType	10-K
CY2016Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	108324750	shares
CY2015	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2015	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2015Q2	dei	Entity Public Float EntityPublicFloat	4355210235	USD
CY2015	dei	Entity Registrant Name EntityRegistrantName	GULFPORT ENERGY CORP
CY2015	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2015	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2015	gpor	Accounts Receivable Collection Period AccountsReceivableCollectionPeriod	P30D
CY2011Q1	gpor	Affiliates Participation In Acquisition Ratio AffiliatesParticipationInAcquisitionRatio	0.5
CY2013	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	14900000	USD
CY2014	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	25200000	USD
CY2015	gpor	Capitalized General And Administrative Costs CapitalizedGeneralAndAdministrativeCosts	27900000	USD
CY2013	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	4198000	USD
CY2014	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	5944000	USD
CY2015	gpor	Capitalized Stock Based Compensation CapitalizedStockBasedCompensation	5743000	USD
CY2014Q4	gpor	Certificates Of Deposit Securing Letter Of Credit CertificatesOfDepositSecuringLetterOfCredit	275000	USD
CY2015Q4	gpor	Certificates Of Deposit Securing Letter Of Credit CertificatesOfDepositSecuringLetterOfCredit	276000	USD
CY2013	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	186473000	USD
CY2014	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	683237000	USD
CY2015	gpor	Change In Production Rates And Other ChangeInProductionRatesAndOther	314960000	USD
CY2015	gpor	Conversion Ratio Gas To Barrels Of Oil ConversionRatioGasToBarrelsOfOil	6
CY2013	gpor	Costs Incurred Recompletions Of Oil And Gas Properties CostsIncurredRecompletionsOfOilAndGasProperties	44633000	USD
CY2014	gpor	Costs Incurred Recompletions Of Oil And Gas Properties CostsIncurredRecompletionsOfOilAndGasProperties	45658000	USD
CY2015	gpor	Costs Incurred Recompletions Of Oil And Gas Properties CostsIncurredRecompletionsOfOilAndGasProperties	13894000	USD
CY2014Q4	gpor	Cumulative Capitalization Of General And Administrative Costs Incurred And Capitalized To Full Cost Pool CumulativeCapitalizationOfGeneralAndAdministrativeCostsIncurredAndCapitalizedToFullCostPool	72700000	USD
CY2015Q4	gpor	Cumulative Capitalization Of General And Administrative Costs Incurred And Capitalized To Full Cost Pool CumulativeCapitalizationOfGeneralAndAdministrativeCostsIncurredAndCapitalizedToFullCostPool	100600000	USD
CY2013Q3	gpor	Debt Instrument Covenant Compliance Earnings Before Income Tax Depreciation Depletion Amortization And Exploration Expenses Ratio DebtInstrumentCovenantComplianceEarningsBeforeIncomeTaxDepreciationDepletionAmortizationAndExplorationExpensesRatio	3.00
CY2013	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	969000	USD
CY2014	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	-3875000	USD
CY2015	gpor	Debt Instrument Increase Decrease Accrued Interest DebtInstrumentIncreaseDecreaseAccruedInterest	-4011000	USD
CY2013	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	84951000	USD
CY2014	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	122917000	USD
CY2015	gpor	Deferred Income Tax Expense Benefit Including Discontinued Operations DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations	-254493000	USD
CY2013Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	0	USD
CY2014Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	0	USD
CY2015Q4	gpor	Deferred Tax Asset Oiland Gas Property Basis Difference DeferredTaxAssetOilandGasPropertyBasisDifference	292838000	USD
CY2013Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	249000	USD
CY2014Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	849000	USD
CY2013Q4	gpor	Deferred Tax Liability Oil And Gas Property Basis Difference DeferredTaxLiabilityOilAndGasPropertyBasisDifference	72173000	USD
CY2015Q4	gpor	Deferred Tax Liabilities Nonoil And Gas Property Basis Difference DeferredTaxLiabilitiesNonoilAndGasPropertyBasisDifference	715000	USD
CY2014Q4	gpor	Deferred Tax Liability Oil And Gas Property Basis Difference DeferredTaxLiabilityOilAndGasPropertyBasisDifference	183767000	USD
CY2015Q4	gpor	Deferred Tax Liability Oil And Gas Property Basis Difference DeferredTaxLiabilityOilAndGasPropertyBasisDifference	0	USD
CY2013	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	4.78	USD
CY2014	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	3.01	USD
CY2015	gpor	Depletionper Mc Fof Gas Equivalent DepletionperMCFofGasEquivalent	1.68	USD
CY2013Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	78647000	USD
CY2014Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	71229000	USD
CY2015Q4	gpor	Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves Future Production Taxes DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesFutureProductionTaxes	58169000	USD
CY2012Q4	gpor	Employment Agreement Notice Period Allowed For Termination EmploymentAgreementNoticePeriodAllowedForTermination	P90D
CY2012Q4	gpor	Employment Agreement Subsequent Extension EmploymentAgreementSubsequentExtension	P1Y
CY2015	gpor	Employment Agreement Term EmploymentAgreementTerm	P3Y
CY2015Q4	gpor	Equity Method Investment Shares Owned EquityMethodInvestmentSharesOwned	0	shares
CY2013	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	-12223000	USD
CY2014	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	-16894000	USD
CY2015	gpor	Foreign Currency Translation Gain Loss On Investment In Equity Method Investment ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment	-28502000	USD
CY2013	gpor	Future Development Costs Estimated To Be Spent In Year One FutureDevelopmentCostsEstimatedToBeSpentInYearOne	158400000	USD
CY2014	gpor	Future Development Costs Estimated To Be Spent In Year One FutureDevelopmentCostsEstimatedToBeSpentInYearOne	177600000	USD
CY2015	gpor	Future Development Costs Estimated To Be Spent In Year One FutureDevelopmentCostsEstimatedToBeSpentInYearOne	170300000	USD
CY2015Q2	gpor	Gas And Oil Area Gross GasAndOilAreaGross	4950	acre
CY2015	gpor	Gas And Oil Area Reserve GasAndOilAreaReserve	243000	acre
CY2013	gpor	Gas Sales GasSales	21015000	USD
CY2014	gpor	Gas Sales GasSales	329254000	USD
CY2015	gpor	Gas Sales GasSales	507726000	USD
CY2013	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-2465000	USD
CY2014	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-7201000	USD
CY2015	gpor	Increase Decrease In Asset Retirement Obligation IncreaseDecreaseInAssetRetirementObligation	-1121000	USD
CY2012	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	0	USD
CY2013	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	2262000	USD
CY2014	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	-2353000	USD
CY2015	gpor	Interest Cost Capitalized Not Subjectto Amortization InterestCostCapitalizedNotSubjecttoAmortization	3674000	USD
CY2013	gpor	Interest Expense Debt Other InterestExpenseDebtOther	11000	USD
CY2014	gpor	Interest Expense Debt Other InterestExpenseDebtOther	0	USD
CY2015	gpor	Interest Expense Debt Other InterestExpenseDebtOther	0	USD
CY2013	gpor	Interest Income Note Receivable InterestIncomeNoteReceivable	26000	USD
CY2014	gpor	Interest Income Note Receivable InterestIncomeNoteReceivable	46000	USD
CY2015	gpor	Interest Income Note Receivable InterestIncomeNoteReceivable	0	USD
CY2015Q2	gpor	Lineof Credit Facility Unsecured Debt Issuance Restriction LineofCreditFacilityUnsecuredDebtIssuanceRestriction	1200000000.0	USD
CY2013	gpor	Natural Gas Liquids Sales NaturalGasLiquidsSales	17081000	USD
CY2014	gpor	Natural Gas Liquids Sales NaturalGasLiquidsSales	94127000	USD
CY2015	gpor	Natural Gas Liquids Sales NaturalGasLiquidsSales	59448000	USD
CY2013	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	65573000	USD
CY2014	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	97716000	USD
CY2015	gpor	Net Changes In Prices Production Costs And Development NetChangesInPricesProductionCostsAndDevelopment	-1412181000	USD
CY2014	gpor	Number Of Financial Institutions NumberOfFinancialInstitutions	4	financial_institution
CY2013	gpor	Oil And Condensate Sales OilAndCondensateSales	224129000	USD
CY2014	gpor	Oil And Condensate Sales OilAndCondensateSales	247381000	USD
CY2015	gpor	Oil And Condensate Sales OilAndCondensateSales	141816000	USD
CY2014Q4	gpor	Other Assets Other OtherAssetsOther	117000	USD
CY2015Q4	gpor	Other Assets Other OtherAssetsOther	37000	USD
CY2014Q4	gpor	Plugging And Abandonment Escrow Account PluggingAndAbandonmentEscrowAccount	3097000	USD
CY2015Q4	gpor	Plugging And Abandonment Escrow Account PluggingAndAbandonmentEscrowAccount	3089000	USD
CY2014Q4	gpor	Prepaid Drilling Costs PrepaidDrillingCosts	483000	USD
CY2015Q4	gpor	Prepaid Drilling Costs PrepaidDrillingCosts	58000	USD
CY2015	gpor	Production Delivered Under Fixed Price Swaps Percentage ProductionDeliveredUnderFixedPriceSwapsPercentage	0.46
CY2013	gpor	Results Of Operations Income Tax Expense Current ResultsOfOperationsIncomeTaxExpenseCurrent	0	USD
CY2014	gpor	Results Of Operations Income Tax Expense Current ResultsOfOperationsIncomeTaxExpenseCurrent	0	USD
CY2015	gpor	Results Of Operations Income Tax Expense Current ResultsOfOperationsIncomeTaxExpenseCurrent	0	USD
CY2013	gpor	Results Of Operations Income Tax Expense Deferred ResultsOfOperationsIncomeTaxExpenseDeferred	49447000	USD
CY2014	gpor	Results Of Operations Income Tax Expense Deferred ResultsOfOperationsIncomeTaxExpenseDeferred	96061000	USD
CY2015	gpor	Results Of Operations Income Tax Expense Deferred ResultsOfOperationsIncomeTaxExpenseDeferred	-220201000	USD
CY2011Q1	gpor	Right Of Refusal Period Allowed RightOfRefusalPeriodAllowed	P6M
CY2015Q4	gpor	Sales Commitment Volume SalesCommitmentVolume	1452000
CY2015	gpor	Sharebased Compensation Arrangement By Sharebased Payment Award Options Granted Additional Time Over Vesting Period SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsGrantedAdditionalTimeOverVestingPeriod	P1Y
CY2013	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	820637000	USD
CY2014	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	1354801000	USD
CY2015	gpor	Total Costs Incurred In Oil And Gas Properties Acquisition And Development Activities TotalCostsIncurredInOilAndGasPropertiesAcquisitionAndDevelopmentActivities	1476260000	USD
CY2014Q4	gpor	Total Other Assets TotalOtherAssets	400505000	USD
CY2015Q4	gpor	Total Other Assets TotalOtherAssets	374770000	USD
CY2014Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	371410000	USD
CY2015Q4	us-gaap	Accounts Payable And Accrued Liabilities Current AccountsPayableAndAccruedLiabilitiesCurrent	265128000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	103858000	USD
CY2015Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	71872000	USD
CY2013	us-gaap	Accretion Of Discount AccretionOfDiscount	34864000	USD
CY2014	us-gaap	Accretion Of Discount AccretionOfDiscount	57847000	USD
CY2015	us-gaap	Accretion Of Discount AccretionOfDiscount	142717000	USD
CY2015Q4	us-gaap	Accumulated Capitalized Interest Costs AccumulatedCapitalizedInterestCosts	3583000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1050879000	USD
CY2015Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2829110000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	2442000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-9781000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-26675000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-55175000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-26675000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-55177000	USD
CY2012	us-gaap	Acquisition Costs AcquisitionCosts	522872000	USD
CY2013	us-gaap	Acquisition Costs AcquisitionCosts	273146000	USD
CY2014	us-gaap	Acquisition Costs AcquisitionCosts	361167000	USD
CY2015	us-gaap	Acquisition Costs AcquisitionCosts	621519000	USD
CY2015Q4	us-gaap	Acquisition Costs Cumulative AcquisitionCostsCumulative	1778704000	USD
CY2014Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1828602000	USD
CY2015Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2824303000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10495000	USD
CY2014	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14860000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	14359000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10500000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14900000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	14400000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	0	USD
CY2013	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	298000	USD
CY2014	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-533000	USD
CY2015	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-2165000	USD
CY2013	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1012000	USD
CY2014	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	1685000	USD
CY2015	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3219000	USD
CY2013	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
CY2014	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
CY2015	us-gaap	Amount Of Dilutive Securities Stock Options And Restrictive Stock Units AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits	0	USD
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2014	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2015	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	449880	shares
CY2013Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	15083000	USD
CY2014Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	17938000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	26437000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	717000	USD
CY2014	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	761000	USD
CY2015	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	820000	USD
CY2014Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	75000	USD
CY2015Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	75000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	3556000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	9295000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	8800000	USD
CY2014	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	7201000	USD
CY2015	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1121000	USD
CY2014Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	17863000	USD
CY2015Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	26362000	USD
CY2014Q4	us-gaap	Assets Assets	3619473000	USD
CY2015Q4	us-gaap	Assets Assets	3334734000	USD
CY2014Q4	us-gaap	Assets Current AssetsCurrent	328349000	USD
CY2015Q4	us-gaap	Assets Current AssetsCurrent	331561000	USD
CY2013	us-gaap	Average Sales Prices AverageSalesPrices	3.67
CY2013	us-gaap	Average Sales Prices AverageSalesPrices	96.78
CY2014	us-gaap	Average Sales Prices AverageSalesPrices	4.35
CY2014	us-gaap	Average Sales Prices AverageSalesPrices	94.99
CY2015	us-gaap	Average Sales Prices AverageSalesPrices	2.59
CY2014Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	5398000	USD
CY2015Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	16915000	USD
CY2014Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	1044273000	USD
CY2015Q4	us-gaap	Capitalized Costs Accumulated Depreciation Depletion Amortization And Valuation Allowance For Relating To Oil And Gas Producing Activities CapitalizedCostsAccumulatedDepreciationDepletionAmortizationAndValuationAllowanceForRelatingToOilAndGasProducingActivities	2820113000	USD
CY2012	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	523329000	USD
CY2013	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	276844000	USD
CY2014	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	363502000	USD
CY2015	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortization	654026000	USD
CY2014Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1465538000	USD
CY2015Q4	us-gaap	Capitalized Costs Of Unproved Properties Excluded From Amortization Cumulative CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative	1817701000	USD
CY2014Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	3923154000	USD
CY2015Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Gross CapitalizedCostsOilAndGasProducingActivitiesGross	5424342000	USD
CY2014Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2878881000	USD
CY2015Q4	us-gaap	Capitalized Costs Oil And Gas Producing Activities Net CapitalizedCostsOilAndGasProducingActivitiesNet	2604229000	USD
CY2014Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	2457616000	USD
CY2015Q4	us-gaap	Capitalized Costs Proved Properties CapitalizedCostsProvedProperties	3606641000	USD
CY2014Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	1465538000	USD
CY2015Q4	us-gaap	Capitalized Costs Unproved Properties CapitalizedCostsUnprovedProperties	1817701000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	167088000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	458956000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	142340000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	112974000	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	291868000	USD
CY2014	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-316616000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-29366000	USD
CY2015Q4	us-gaap	Cash Uninsured Amount CashUninsuredAmount	112000000	USD
CY2014Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2015Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2014Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2015Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2015Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	200000000	shares
CY2014Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	85655438	shares
CY2015Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	108322250	shares
CY2014Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	85655438	shares
CY2015Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	108322250	shares
CY2014Q4	us-gaap	Common Stock Value CommonStockValue	856000	USD
CY2015Q4	us-gaap	Common Stock Value CommonStockValue	1082000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	146840000	USD
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	230509000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1253386000	USD
CY2013	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	338153000	USD
CY2014	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	440288000	USD
CY2015	us-gaap	Costs Incurred Acquisition Of Oil And Gas Properties CostsIncurredAcquisitionOfOilAndGasProperties	810755000	USD
CY2013	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	3556000	USD
CY2014	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	2095000	USD
CY2015	us-gaap	Costs Incurred Asset Retirement Obligation Incurred CostsIncurredAssetRetirementObligationIncurred	8800000	USD
CY2013	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	408121000	USD
CY2014	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	864511000	USD
CY2015	us-gaap	Costs Incurred Development Costs CostsIncurredDevelopmentCosts	642811000	USD
CY2013	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	26174000	USD
CY2014	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	2249000	USD
CY2015	us-gaap	Costs Incurred Exploration Costs CostsIncurredExplorationCosts	0	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-439000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6860000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	6325000	USD
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	16039000	USD
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	14384000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-1069000	USD
CY2015Q4	us-gaap	Debt Instrument Fair Value DebtInstrumentFairValue	846900000	USD
CY2015Q4	us-gaap	Debt Instrument Unamortized Discount DebtInstrumentUnamortizedDiscount	2500000	USD
CY2014Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-14658000	USD
CY2015Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-12493000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	77566000	USD
CY2014	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	118604000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-240275000	USD
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	127716000	USD
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	259937000	USD
CY2015Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	74567000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7385000	USD
CY2014	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	4314000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-14218000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	25000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	150000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	146000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	25111000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	32817000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	380577000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	8540000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Hedging Transactions DeferredTaxAssetsHedgingTransactions	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	24228000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	0	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	74925000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	74925000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	20368000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	29672000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	98795000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1462000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1091000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	46209000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4408000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	2627000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4344000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	7968000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	24053000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	23629000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	23600000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2074000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2074000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2100000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	2074000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	634000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1562000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1922000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	0	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1260000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	0	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	0	USD
CY2014Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	0	USD
CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3145000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Asset Retirement Obligations DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations	9415000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	4743000	USD
CY2015Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	281782000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	107348000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	230265000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	27070000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	50697000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	0	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	37006000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	66422000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	203195000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Gross Noncurrent DeferredTaxLiabilitiesGrossNoncurrent	0	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	46495000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	8799000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	38315000	USD
CY2015Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	7430000	USD
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	600000	USD
CY2014	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	800000	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1400000	USD
CY2015	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1
CY2014Q4	us-gaap	Deposit Assets DepositAssets	34000	USD
CY2015Q4	us-gaap	Deposit Assets DepositAssets	34000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	118880000	USD
CY2014	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	265431000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	337694000	USD
CY2014Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	78391000	USD
CY2015Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	142794000	USD
CY2014Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	24448000	USD
CY2015Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	51088000	USD
CY2014Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	0	USD
CY2015Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	437000	USD
CY2014Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	0	USD
CY2015Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	6935000	USD
CY2012	us-gaap	Development Costs DevelopmentCosts	457000	USD
CY2013	us-gaap	Development Costs DevelopmentCosts	1436000	USD
CY2014	us-gaap	Development Costs DevelopmentCosts	4688000	USD
CY2015	us-gaap	Development Costs DevelopmentCosts	28833000	USD
CY2015Q4	us-gaap	Development Costs Cumulative DevelopmentCostsCumulative	35414000	USD
CY2014Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2015Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	0	USD
CY2014Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	46000	USD
CY2015Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	16000	USD
CY2014Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2015Q4	us-gaap	Due To Affiliate Current DueToAffiliateCurrent	0	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98
CY2014Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.97
CY2014Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.56
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.29
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.90
CY2015Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
CY2015Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.32
CY2015Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-3.59
CY2015Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-7.67
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-12.27
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97
CY2014Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2014Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.56
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08
CY2014Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.28
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.88
CY2015Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2015Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.32
CY2015Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-3.59
CY2015Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-7.67
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-12.27
CY2015Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	15700000	USD
CY2015	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y6M18D
CY2013	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	1276000	USD
CY2014	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	0	USD
CY2015	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4914000	USD
CY2014Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	181060000	USD
CY2015Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	105537000	USD
CY2014Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	114506000	USD
CY2015Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	56559000	USD
CY2013	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-17350000	USD
CY2014	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-140796000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	16761000	USD
CY2014Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1306891000	USD
CY2015Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1293925000	USD
CY2014Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	230062000	USD
CY2015Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	155995000	USD
CY2013	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	162401000	USD
CY2014	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	390620000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	430729000	USD
CY2014Q4	us-gaap	Equity Method Investments EquityMethodInvestments	369581000	USD
CY2015Q4	us-gaap	Equity Method Investments EquityMethodInvestments	242393000	USD
CY2012	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2013	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2014	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2015	us-gaap	Exploration Costs ExplorationCosts	0	USD
CY2014	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	54171000	USD
CY2015Q4	us-gaap	Exploration Costs Cumulative ExplorationCostsCumulative	0	USD
CY2013	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	130826000	USD
CY2014	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	790533000	USD
CY2015	us-gaap	Extensions Discoveries Additions And Improved Recovery Less Related Costs ExtensionsDiscoveriesAdditionsAndImprovedRecoveryLessRelatedCosts	262895000	USD
CY2014Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	10752000	USD
CY2015Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	12589000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	1657708000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	4667678000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Cash Inflows FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows	3043450000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	272500000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	719898000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Development Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts	877660000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	172691000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	693154000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Income Tax Expense FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense	2648000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	859442000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	2302970000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Net Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows	1163730000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	274428000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	880427000	USD
CY2015Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Production Costs FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts	941243000	USD
CY2013Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	280976000	USD
CY2014Q4	us-gaap	Future Net Cash Flows Relating To Proved Oil And Gas Reserves Ten Percent Annual Discount For Estimated Timing Of Cash Flows FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows	875803000	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	399399000	USD
CY2013	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	-18189000	USD
CY2014	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	121148000	USD
CY2015	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	83671000	USD
CY2013	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	-18189000	USD
CY2014	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	121148000	USD
CY2015	us-gaap	Gain Loss On Fair Value Hedge Ineffectiveness Net GainLossOnFairValueHedgeIneffectivenessNet	83671000	USD
CY2013	us-gaap	Gain Loss On Investments GainLossOnInvestments	0	USD
CY2014	us-gaap	Gain Loss On Investments GainLossOnInvestments	84470000	USD
CY2015	us-gaap	Gain Loss On Investments GainLossOnInvestments	0	USD
CY2013	us-gaap	Gain Loss On Sale Of Oil And Gas Property GainLossOnSaleOfOilAndGasProperty	-508000	USD
CY2014	us-gaap	Gain Loss On Sale Of Oil And Gas Property GainLossOnSaleOfOilAndGasProperty	11000	USD
CY2015	us-gaap	Gain Loss On Sale Of Oil And Gas Property GainLossOnSaleOfOilAndGasProperty	0	USD
CY2013	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	11030000	USD
CY2014	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	64467000	USD
CY2015	us-gaap	Gas Gathering Transportation Marketing And Processing Costs GasGatheringTransportationMarketingAndProcessingCosts	138590000	USD
CY2013	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	22519000	USD
CY2014	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	38290000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	41967000	USD
CY2013	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2014	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	0	USD
CY2013	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	212714000	USD
CY2015	us-gaap	Impairment Of Oil And Gas Properties ImpairmentOfOilAndGasProperties	1440418000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	251328000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	400744000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-1480885000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	213058000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	139434000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-106093000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-113120000	USD
CY2015	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	98136000	USD
CY2014Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	49247000	USD
CY2014Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	31461000	USD
CY2014Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4876000	USD
CY2014Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	67757000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	153341000	USD
CY2015Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14479000	USD
CY2015Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-17214000	USD
CY2015Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-216603000	USD
CY2015Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-36663000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-256001000	USD
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2014	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	278637000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	87965000	USD
CY2014	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	140259000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-518310000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	874000	USD
CY2014	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1512000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-420000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9297000	USD
CY2014	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11570000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-15908000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	2761000	USD
CY2014	us-gaap	Income Taxes Paid IncomeTaxesPaid	23800000	USD
CY2015	us-gaap	Income Taxes Paid IncomeTaxesPaid	16156000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	29310000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	73925000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-47199000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	33209000	USD
CY2014	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	45034000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-31986000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-32231000	USD
CY2014	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-2571000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable Related Parties IncreaseDecreaseInAccountsReceivableRelatedParties	-30000	USD
CY2013	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-30239000	USD
CY2014	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	-295226000	USD
CY2015	us-gaap	Increase Decrease In Future Income Tax Expense Estimates On Future Cash Flows Related To Proved Oil And Gas Reserves IncreaseDecreaseInFutureIncomeTaxExpenseEstimatesOnFutureCashFlowsRelatedToProvedOilAndGasReserves	412240000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4523000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	0	USD
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	0	USD
CY2013	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	1075000	USD
CY2014	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	1133000	USD
CY2015	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	191000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-8000	USD
CY2014	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-8000	USD
CY2015	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-8000	USD
CY2013	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	0	USD
CY2014	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	14266000	USD
CY2015	us-gaap	Increase Due To Purchases Of Minerals In Place IncreaseDueToPurchasesOfMineralsInPlace	83340000	USD
CY2013	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2014	us-gaap	Insurance Recoveries InsuranceRecoveries	0	USD
CY2015	us-gaap	Insurance Recoveries InsuranceRecoveries	10015000	USD
CY2013	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	7132000	USD
CY2014	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	9687000	USD
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	13580000	USD
CY2013	us-gaap	Interest Expense InterestExpense	17490000	USD
CY2014	us-gaap	Interest Expense InterestExpense	23986000	USD
CY2015	us-gaap	Interest Expense InterestExpense	51221000	USD
CY2013	us-gaap	Interest Expense Debt InterestExpenseDebt	17490000	USD
CY2014	us-gaap	Interest Expense Debt InterestExpenseDebt	23986000	USD
CY2015	us-gaap	Interest Expense Debt InterestExpenseDebt	51221000	USD
CY2013	us-gaap	Interest Paid InterestPaid	24270000	USD
CY2014	us-gaap	Interest Paid InterestPaid	28646000	USD
CY2015	us-gaap	Interest Paid InterestPaid	59736000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	24280000	USD
CY2014	us-gaap	Interest Paid Net InterestPaidNet	28646000	USD
CY2013	us-gaap	Investment Income Interest InvestmentIncomeInterest	297000	USD
CY2014	us-gaap	Investment Income Interest InvestmentIncomeInterest	195000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	643000	USD
CY2014Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	0	USD
CY2015Q4	us-gaap	Investments Fair Value Disclosure InvestmentsFairValueDisclosure	0	USD
CY2014Q4	us-gaap	Land Land	2194000	USD
CY2015Q4	us-gaap	Land Land	3667000	USD
CY2013	us-gaap	Lease Operating Expense LeaseOperatingExpense	26703000	USD
CY2014	us-gaap	Lease Operating Expense LeaseOperatingExpense	52191000	USD
CY2015	us-gaap	Lease Operating Expense LeaseOperatingExpense	69475000	USD
CY2014Q4	us-gaap	Liabilities Liabilities	1323177000	USD
CY2015Q4	us-gaap	Liabilities Liabilities	1295897000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3619473000	USD
CY2015Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3334734000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	398723000	USD
CY2015Q4	us-gaap	Liabilities Current LiabilitiesCurrent	316516000	USD
CY2014Q3	us-gaap	Litigation Settlement Amount LitigationSettlementAmount	-18000000	USD
CY2013	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2014	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	25500000	USD
CY2015	us-gaap	Litigation Settlement Expense LitigationSettlementExpense	0	USD
CY2015Q4	us-gaap	Long Term Debt LongTermDebt	951653000	USD
CY2015Q3	us-gaap	Long Term Debt LongTermDebt	10000000.0	USD
CY2014Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	168000	USD
CY2015Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	179000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	350000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	179000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	600000000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1287000	USD
CY2015Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	187000	USD
CY2014Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	703396000	USD
CY2015Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	946084000	USD
CY2013	us-gaap	Loss On Fair Value Hedge Ineffectiveness LossOnFairValueHedgeIneffectiveness	9100000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	765063000	USD
CY2014	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	410168000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1222708000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-664260000	USD
CY2014	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1136657000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1574253000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	191065000	USD
CY2014	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	409873000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	322179000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	153192000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	82558000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	47852000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	6920000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	110073000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	247403000	USD
CY2015Q1	us-gaap	Net Income Loss NetIncomeLoss	25519000	USD
CY2015Q2	us-gaap	Net Income Loss NetIncomeLoss	-31325000	USD
CY2015Q3	us-gaap	Net Income Loss NetIncomeLoss	-388209000	USD
CY2015Q4	us-gaap	Net Income Loss NetIncomeLoss	-830869000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-1224884000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	153192000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	247403000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1224884000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	153192000	USD
CY2014	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	247403000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	-1224884000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	195865000	USD
CY2014	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	174613000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-146656000	USD
CY2014Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	3923154000	USD
CY2015Q4	us-gaap	Oil And Gas Property Full Cost Method Gross OilAndGasPropertyFullCostMethodGross	5424342000	USD
CY2014Q4	us-gaap	Oil And Gas Reclamation Liability Noncurrent OilAndGasReclamationLiabilityNoncurrent	0	USD
CY2015Q4	us-gaap	Oil And Gas Reclamation Liability Noncurrent OilAndGasReclamationLiabilityNoncurrent	0	USD
CY2013	us-gaap	Operating Expenses OperatingExpenses	207290000	USD
CY2014	us-gaap	Operating Expenses OperatingExpenses	445135000	USD
CY2015	us-gaap	Operating Expenses OperatingExpenses	2043704000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	55463000	USD
CY2014Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	25109000	USD
CY2014Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	18110000	USD
CY2014Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	53454000	USD
CY2014Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	129458000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	226131000	USD
CY2015Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	28773000	USD
CY2015Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-21644000	USD
CY2015Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	-529076000	USD
CY2015Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-812282000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	-1334229000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	1437000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	800000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	54000	USD
CY2015Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	583000	USD
CY2013	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	258000	USD
CY2014	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	733000	USD
CY2015	us-gaap	Operating Leases Rent Expense Minimum Rentals OperatingLeasesRentExpenseMinimumRentals	759000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	213000	USD
CY2014	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	718000	USD
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	751000	USD
CY2013	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	45000	USD
CY2014	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	15000	USD
CY2015	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	8000	USD
CY2013	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	875000	USD
CY2014	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	-875000	USD
CY2015	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	0	USD
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6476000	USD
CY2015Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6364000	USD
CY2015Q4	us-gaap	Other Commitment OtherCommitment	144210000	USD
CY2015Q4	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	39330000	USD
CY2015Q4	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	52440000	USD
CY2015Q4	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	52440000	USD
CY2013	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-12223000	USD
CY2014	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-16894000	USD
CY2015	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-28502000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	9100000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6352000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-16894000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-28502000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-9800000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-10290000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-500000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-4419000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	4300000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2013	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	528000	USD
CY2014	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	504000	USD
CY2015	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	485000	USD
CY2013	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	1283000	USD
CY2014	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	7831000	USD
CY2015	us-gaap	Payments Of Loan Costs PaymentsOfLoanCosts	8688000	USD
CY2013	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	47014000	USD
CY2014	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	63999000	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	14472000	USD
CY2013	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	808183000	USD
CY2014	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	1329277000	USD
CY2015	us-gaap	Payments To Acquire Oil And Gas Property PaymentsToAcquireOilAndGasProperty	1579129000	USD
CY2013	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	2322000	USD
CY2014	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	7030000	USD
CY2015	us-gaap	Payments To Acquire Other Property Plant And Equipment PaymentsToAcquireOtherPropertyPlantAndEquipment	13572000	USD
CY2014	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.12
CY2015	us-gaap	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.12
CY2014Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2015Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2015Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2014Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2015Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2014Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2015Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2014Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2015Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2014Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	3714000	USD
CY2015Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	3905000	USD
CY2013	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	43478000	USD
CY2014	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	68227000	USD
CY2015	us-gaap	Previously Estimated Development Costs Incurred PreviouslyEstimatedDevelopmentCostsIncurred	117540000	USD
CY2015Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	501800000	USD
CY2015Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	479700000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	766495000	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	689000	USD
CY2015	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	981568000	USD
CY2013	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	192737000	USD
CY2014	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	258362000	USD
CY2013	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	79441000	USD
CY2014	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	266152000	USD
CY2014	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	318000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	350000000	USD
CY2013	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	0	USD
CY2014	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	215000000	USD
CY2015	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	250000000	USD
CY2015	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2013	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	0	USD
CY2014	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	4404000	USD
CY2015	us-gaap	Proceeds From Sale Of Oil And Gas Property And Equipment ProceedsFromSaleOfOilAndGasPropertyAndEquipment	27998000	USD
CY2013	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	113000	USD
CY2014	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	0	USD
CY2015	us-gaap	Proceeds From Sale Of Other Property Plant And Equipment ProceedsFromSaleOfOtherPropertyPlantAndEquipment	0	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	3941498000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	5457513000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2890619000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	2628403000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	18344000	USD
CY2015Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	33171000	USD
CY2013	us-gaap	Repayments Of Debt RepaymentsOfDebt	149000	USD
CY2014	us-gaap	Repayments Of Debt RepaymentsOfDebt	115690000	USD
CY2015	us-gaap	Repayments Of Debt RepaymentsOfDebt	350172000	USD
CY2013	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	118118000	USD
CY2014	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	263946000	USD
CY2015	us-gaap	Results Of Operations Depreciation Depletion And Amortization And Valuation Provisions ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions	335288000	USD
CY2015	us-gaap	Results Of Operations Income Before Income Taxes ResultsOfOperationsIncomeBeforeIncomeTaxes	-1289521000	USD
CY2013	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	49447000	USD
CY2014	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	96061000	USD
CY2015	us-gaap	Results Of Operations Income Tax Expense ResultsOfOperationsIncomeTaxExpense	-220201000	USD
CY2013	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	29994000	USD
CY2014	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	170091000	USD
CY2015	us-gaap	Results Of Operations Oil And Gas Producing Activities Net Income Excluding Corporate Overhead And Interest Costs ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts	-1069320000	USD
CY2013	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	64666000	USD
CY2014	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	140664000	USD
CY2015	us-gaap	Results Of Operations Production Or Lifting Costs ResultsOfOperationsProductionOrLiftingCosts	222805000	USD
CY2013	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	262225000	USD
CY2014	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	670762000	USD
CY2015	us-gaap	Results Of Operations Revenue From Oil And Gas Producing Activities ResultsOfOperationsRevenueFromOilAndGasProducingActivities	708990000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	493513000	USD
CY2015Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-731371000	USD
CY2013	us-gaap	Revenues Revenues	262753000	USD
CY2014Q1	us-gaap	Revenues Revenues	118029000	USD
CY2014Q2	us-gaap	Revenues Revenues	114736000	USD
CY2014Q3	us-gaap	Revenues Revenues	170804000	USD
CY2014Q4	us-gaap	Revenues Revenues	267697000	USD
CY2014	us-gaap	Revenues Revenues	671266000	USD
CY2015Q1	us-gaap	Revenues Revenues	176317000	USD
CY2015Q2	us-gaap	Revenues Revenues	112270000	USD
CY2015Q3	us-gaap	Revenues Revenues	230569000	USD
CY2015Q4	us-gaap	Revenues Revenues	190319000	USD
CY2015	us-gaap	Revenues Revenues	709475000	USD
CY2013	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-3591000	USD
CY2014	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-37801000	USD
CY2015	us-gaap	Revisions Of Previous Quantity Estimates RevisionsOfPreviousQuantityEstimates	-98162000	USD
CY2013	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	197559000	USD
CY2014	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	530098000	USD
CY2015	us-gaap	Sales And Transfers Of Oil And Gas Produced Net Of Production Costs SalesAndTransfersOfOilAndGasProducedNetOfProductionCosts	486185000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	6297000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	8916000	USD
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	8616000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	0	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	0.00
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4797000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12822000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	124000	USD
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	0	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	0.00
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.00
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.00
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	0.00
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	10678000	USD
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	12538000	USD
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	163000	USD
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	335241	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	210241	shares
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	5000	shares
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.37
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	3.50
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	9.07
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	0.00
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.20
CY2014	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	3.36
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	9.07
CY2015Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0	USD
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P0Y
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y4M20D
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y0M25D
CY2014	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0Y8M8D
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P0Y
CY2013	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	229825000	USD
CY2014	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	848701000	USD
CY2015	us-gaap	Standardized Measure Of Discounted Future Net Cash Flow Of Proved Oil And Gas Reserves Period Increase Decrease StandardizedMeasureOfDiscountedFutureNetCashFlowOfProvedOilAndGasReservesPeriodIncreaseDecrease	-662836000	USD
CY2013Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	578466000	USD
CY2014Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	1427167000	USD
CY2015Q4	us-gaap	Standardized Measure Of Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves	764331000	USD
CY2013	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	125000	shares
CY2014	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	205241	shares
CY2015	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	5000	shares
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	765095000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	981523000	USD
CY2013	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2014	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1400000	USD
CY2014	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	689000	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	45000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1126408000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	2050238000	USD
CY2014Q4	us-gaap	Stockholders Equity StockholdersEquity	2296296000	USD
CY2015Q4	us-gaap	Stockholders Equity StockholdersEquity	2038837000	USD
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	26933000	USD
CY2014	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	24006000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	14740000	USD
CY2014Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	17700000	USD
CY2015Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	0	USD
CY2014Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	30000	shares
CY2015Q4	us-gaap	Temporary Equity Shares Authorized TemporaryEquitySharesAuthorized	30000	shares
CY2014Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	12920000	USD
CY2015Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	17883000	USD
CY2014Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	2470000	USD
CY2015Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	2870000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2013	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	485963	shares
CY2014	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	367219	shares
CY2015	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	0	shares
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	77861646	shares
CY2014	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	85813182	shares
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	99792401	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	77375683	shares
CY2014	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85445963	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99792401	shares
CY2015	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:16px;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">CONTINGENCIES</font></div><div style="line-height:120%;padding-bottom:16px;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Due to the nature of the Company's business, it is, from time to time, involved in routine litigation or subject to disputes or claims related to its business activities, including workers' compensation claims and employment related disputes. In the opinion of the Company's management, none of the pending litigation, disputes or claims against the Company, if decided adversely, will have a material adverse effect on its financial condition, cash flows or results of operations.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Insurance Proceeds</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:30px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In September 2014, the Company settled its legacy surface contamination lawsuit with Reeds et al. Under the terms of the settlement agreement, Gulfport paid </font><font style="font-family:inherit;font-size:10pt;">$18.0 million</font><font style="font-family:inherit;font-size:10pt;">, which is included in litigation settlement in the accompanying consolidated statements of operations for the year ended December 31, 2014. In October 2015, the Company was reimbursed </font><font style="font-family:inherit;font-size:10pt;">$10.0 million</font><font style="font-family:inherit;font-size:10pt;">, net of related legal fees, by its insurance provider which is included in insurance proceeds in the accompanying consolidated statements of operations for the year ended December 31, 2015.</font></div><div style="line-height:120%;padding-bottom:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Concentration of Credit Risk</font></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Gulfport operates in the oil and natural gas industry principally in the states of Ohio and Louisiana with sales to refineries, re-sellers such as pipeline companies, and local distribution companies. While certain of these customers are affected by periodic downturns in the economy in general or in their specific segment of the oil and gas industry, Gulfport believes that its level of credit-related losses due to such economic fluctuations has been immaterial and will continue to be immaterial to the Company’s results of operations in the long term.</font></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company maintains cash balances at several banks. Accounts at each institution are insured by the Federal Deposit Insurance Corporation up to </font><font style="font-family:inherit;font-size:10pt;">$250,000</font><font style="font-family:inherit;font-size:10pt;">. At </font><font style="font-family:inherit;font-size:10pt;">December 31, 2015</font><font style="font-family:inherit;font-size:10pt;">, Gulfport held cash in excess of insured limits in these banks totaling </font><font style="font-family:inherit;font-size:10pt;">$112.0 million</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">During the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2015</font><font style="font-family:inherit;font-size:10pt;">, Gulfport sold approximately </font><font style="font-family:inherit;font-size:10pt;">90%</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">10%</font><font style="font-family:inherit;font-size:10pt;"> of its oil production to Shell Trading Company (“Shell”) and Marathon Oil Corporation, respectively, </font><font style="font-family:inherit;font-size:10pt;">76%</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">24%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas liquids production to MarkWest Utica EMG ("Mark West") and Antero Resources, respectively, and </font><font style="font-family:inherit;font-size:10pt;">79%</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">14%</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">5%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas production to BP Energy Company ("BP"), DTE Energy Trading Inc. and Hess, respectively. During the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2014</font><font style="font-family:inherit;font-size:10pt;">, Gulfport sold approximately </font><font style="font-family:inherit;font-size:10pt;">99%</font><font style="font-family:inherit;font-size:10pt;"> of its oil production to Shell, </font><font style="font-family:inherit;font-size:10pt;">100%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas liquids production to MarkWest and </font><font style="font-family:inherit;font-size:10pt;">40%</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">32%</font><font style="font-family:inherit;font-size:10pt;"> and </font><font style="font-family:inherit;font-size:10pt;">19%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas production to BP, DTE Energy Trading Inc. and Hess, respectively. During the year ended </font><font style="font-family:inherit;font-size:10pt;">December 31, 2013</font><font style="font-family:inherit;font-size:10pt;">, Gulfport sold approximately </font><font style="font-family:inherit;font-size:10pt;">99%</font><font style="font-family:inherit;font-size:10pt;"> of its oil production to Shell, </font><font style="font-family:inherit;font-size:10pt;">100%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas liquids production to MarkWest and </font><font style="font-family:inherit;font-size:10pt;">32%</font><font style="font-family:inherit;font-size:10pt;">, </font><font style="font-family:inherit;font-size:10pt;">31%</font><font style="font-family:inherit;font-size:10pt;">, and </font><font style="font-family:inherit;font-size:10pt;">17%</font><font style="font-family:inherit;font-size:10pt;"> of its natural gas production to Sequent Energy Management, L.P., Hess and Interstate Gas Supply Inc., respectively.</font></div></div>
CY2015	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:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Reclassification</font></div><div style="line-height:120%;padding-bottom:16px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain reclassifications have been made to prior period financial statements to conform to current period presentation.</font></div></div>
CY2015	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Use of Estimates</font></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and revenues and expenses during the reporting period. Actual results could differ materially from those estimates. Significant estimates with regard to these financial statements include the estimate of proved oil and gas reserve quantities and the related present value of estimated future net cash flows there from, the amount and timing of asset retirement obligations, the realization of deferred tax assets and the realization of future net operating loss carryforwards available as reductions of income tax expense. The estimate of the Company’s oil and gas reserves is used to compute depletion, depreciation, amortization and impairment of oil and gas properties.</font></div></div>

Files In Submission

Name	View Source	Status
0001628280-16-011417-index-headers.html	Edgar Link	pending
0001628280-16-011417-index.html	Edgar Link	pending
0001628280-16-011417.txt	Edgar Link	pending
0001628280-16-011417-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
gpor-12312015x10k.htm	Edgar Link	pending
gpor-20151231.xml	Edgar Link	completed
gpor-20151231.xsd	Edgar Link	pending
gpor-20151231xex1019.htm	Edgar Link	pending
gpor-20151231xex21.htm	Edgar Link	pending
gpor-20151231xex231.htm	Edgar Link	pending
gpor-20151231xex232.htm	Edgar Link	pending
gpor-20151231xex233.htm	Edgar Link	pending
gpor-20151231xex311.htm	Edgar Link	pending
gpor-20151231xex312.htm	Edgar Link	pending
gpor-20151231xex321.htm	Edgar Link	pending
gpor-20151231xex322.htm	Edgar Link	pending
gpor-20151231xex991use.htm	Edgar Link	pending
gpor-20151231_cal.xml	Edgar Link	unprocessable
gpor-20151231_def.xml	Edgar Link	unprocessable
gpor-20151231_lab.xml	Edgar Link	unprocessable
gpor-20151231_pre.xml	Edgar Link	unprocessable
gpor-2015x1231xex234.htm	Edgar Link	pending
nsaismall.jpg	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$GPOR
GULFPORT ENERGY CORP Stock $gpor

2014 Q4 Form 10-K Financial Statement

#000162828016011417 Filed on February 19, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR GULFPORT ENERGY CORP Stock $gpor

2014 Q4 Form 10-K Financial Statement

#000162828016011417 Filed on February 19, 2016

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$GPOR
GULFPORT ENERGY CORP Stock $gpor