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Consolidated Statement of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Oil and gas revenues	$ 1,304,004us-gaap_OilAndGasSalesRevenue	$ 1,084,412us-gaap_OilAndGasSalesRevenue	$ 670,491us-gaap_OilAndGasSalesRevenue
Well services and midstream revenues	86,224us-gaap_RevenueOilAndGasServices	57,587us-gaap_RevenueOilAndGasServices	16,177us-gaap_RevenueOilAndGasServices
Total revenues	1,390,228us-gaap_OilAndGasRevenue	1,141,999us-gaap_OilAndGasRevenue	686,668us-gaap_OilAndGasRevenue
Expenses
Lease operating expenses	169,600us-gaap_LeaseOperatingExpense	94,634us-gaap_LeaseOperatingExpense	54,924us-gaap_LeaseOperatingExpense
Well services and midstream operating expenses	50,252us-gaap_WellServiceExpense	30,713us-gaap_WellServiceExpense	11,774us-gaap_WellServiceExpense
Marketing, transportation and gathering expenses	29,133us-gaap_GasGatheringTransportationMarketingAndProcessingCosts	25,924us-gaap_GasGatheringTransportationMarketingAndProcessingCosts	9,257us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Production taxes	127,648us-gaap_ProductionTaxExpense	100,537us-gaap_ProductionTaxExpense	62,965us-gaap_ProductionTaxExpense
Depreciation, depletion and amortization	412,334us-gaap_DepreciationDepletionAndAmortization	307,055us-gaap_DepreciationDepletionAndAmortization	206,734us-gaap_DepreciationDepletionAndAmortization
Exploration expenses	3,064us-gaap_ExplorationExpense	2,260us-gaap_ExplorationExpense	3,250us-gaap_ExplorationExpense
Impairment of oil and gas properties	47,238us-gaap_ImpairmentOfOilAndGasProperties	1,168us-gaap_ImpairmentOfOilAndGasProperties	3,581us-gaap_ImpairmentOfOilAndGasProperties
General and administrative expenses	92,306us-gaap_GeneralAndAdministrativeExpense	75,310us-gaap_GeneralAndAdministrativeExpense	57,190us-gaap_GeneralAndAdministrativeExpense
Total expenses	931,575us-gaap_CostsAndExpenses	637,601us-gaap_CostsAndExpenses	409,675us-gaap_CostsAndExpenses
Gain on sale of properties	186,999us-gaap_GainLossOnSaleOfProperty	0us-gaap_GainLossOnSaleOfProperty	0us-gaap_GainLossOnSaleOfProperty
Operating income	645,652us-gaap_OperatingIncomeLoss	504,398us-gaap_OperatingIncomeLoss	276,993us-gaap_OperatingIncomeLoss
Other income (expense)
Net gain (loss) on derivative instruments	327,011us-gaap_DerivativeGainLossOnDerivativeNet	(35,432)us-gaap_DerivativeGainLossOnDerivativeNet	34,164us-gaap_DerivativeGainLossOnDerivativeNet
Interest expense, net of capitalized interest	(158,390)us-gaap_InterestExpense	(107,165)us-gaap_InterestExpense	(70,143)us-gaap_InterestExpense
Other income (expense)	195us-gaap_OtherNonoperatingIncomeExpense	1,216us-gaap_OtherNonoperatingIncomeExpense	4,860us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	168,816us-gaap_NonoperatingIncomeExpense	(141,381)us-gaap_NonoperatingIncomeExpense	(31,119)us-gaap_NonoperatingIncomeExpense
Income before income taxes	814,468us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	363,017us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	245,874us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	307,591us-gaap_IncomeTaxExpenseBenefit	135,058us-gaap_IncomeTaxExpenseBenefit	92,486us-gaap_IncomeTaxExpenseBenefit
Net income	$ 506,877us-gaap_NetIncomeLoss	$ 227,959us-gaap_NetIncomeLoss	$ 153,388us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 5.09us-gaap_EarningsPerShareBasic	$ 2.45us-gaap_EarningsPerShareBasic	$ 1.66us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 5.05us-gaap_EarningsPerShareDiluted	$ 2.44us-gaap_EarningsPerShareDiluted	$ 1.66us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in shares)	99,677us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	92,867us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	92,180us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	100,365us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	93,411us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	92,513us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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