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Condensed Consolidated Statement of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Oil and gas revenues	$ 173,859us-gaap_OilAndGasSalesRevenue	$ 331,847us-gaap_OilAndGasSalesRevenue
Well services and midstream revenues	6,528us-gaap_RevenueOilAndGasServices	17,672us-gaap_RevenueOilAndGasServices
Total revenues	180,387us-gaap_OilAndGasRevenue	349,519us-gaap_OilAndGasRevenue
Expenses
Lease operating expenses	39,125us-gaap_LeaseOperatingExpense	39,989us-gaap_LeaseOperatingExpense
Well services and midstream operating expenses	1,952us-gaap_CostOfServicesOilAndGas	10,920us-gaap_CostOfServicesOilAndGas
Marketing, transportation and gathering expenses	7,278us-gaap_GasGatheringTransportationMarketingAndProcessingCosts	5,186us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
Production taxes	16,621us-gaap_ProductionTaxExpense	31,803us-gaap_ProductionTaxExpense
Depreciation, depletion and amortization	118,478us-gaap_DepreciationDepletionAndAmortization	91,272us-gaap_DepreciationDepletionAndAmortization
Exploration expenses	843us-gaap_ExplorationExpense	380us-gaap_ExplorationExpense
Rig termination	1,080oas_OilandGasRigTerminationExpense	0oas_OilandGasRigTerminationExpense
Impairment of oil and gas properties	5,321us-gaap_ImpairmentOfOilAndGasProperties	762us-gaap_ImpairmentOfOilAndGasProperties
General and administrative expenses	23,324us-gaap_GeneralAndAdministrativeExpense	23,520us-gaap_GeneralAndAdministrativeExpense
Total expenses	214,022us-gaap_CostsAndExpenses	203,832us-gaap_CostsAndExpenses
Gain on sale of properties	0us-gaap_GainLossOnSaleOfProperty	183,393us-gaap_GainLossOnSaleOfProperty
Operating income (loss)	(33,635)us-gaap_OperatingIncomeLoss	329,080us-gaap_OperatingIncomeLoss
Other income (expense)
Net gain (loss) on derivative instruments	47,072us-gaap_DerivativeGainLossOnDerivativeNet	(17,603)us-gaap_DerivativeGainLossOnDerivativeNet
Interest expense, net of capitalized interest	(38,784)us-gaap_InterestExpense	(40,158)us-gaap_InterestExpense
Other income (expense)	(70)us-gaap_OtherNonoperatingIncomeExpense	153us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense)	8,218us-gaap_NonoperatingIncomeExpense	(57,608)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	(25,417)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	271,472us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit (expense)	7,376us-gaap_IncomeTaxExpenseBenefit	(101,519)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ (18,041)us-gaap_NetIncomeLoss	$ 169,953us-gaap_NetIncomeLoss
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.17)us-gaap_EarningsPerShareBasic	$ 1.71us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.17)us-gaap_EarningsPerShareDiluted	$ 1.70us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in shares)	109,303us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	99,560us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	109,303us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	100,049us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.

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