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Condensed Consolidated Balance Sheet (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
ASSETS    
Cash and cash equivalents $ 10,188us-gaap_CashAndCashEquivalentsAtCarryingValue $ 45,811us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable — oil and gas revenues 112,785us-gaap_AccountsReceivableNetCurrent 130,934us-gaap_AccountsReceivableNetCurrent
Accounts receivable — joint interest partners 130,384us-gaap_OilAndGasJointInterestBillingReceivablesCurrent 175,537us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
Inventory 21,956us-gaap_InventoryNet 21,354us-gaap_InventoryNet
Prepaid expenses 16,954us-gaap_PrepaidExpenseCurrent 14,273us-gaap_PrepaidExpenseCurrent
Derivative instruments 253,320us-gaap_DerivativeAssetsCurrent 302,159us-gaap_DerivativeAssetsCurrent
Other current assets 1,000us-gaap_OtherAssetsCurrent 6,539us-gaap_OtherAssetsCurrent
Total current assets 546,587us-gaap_AssetsCurrent 696,607us-gaap_AssetsCurrent
Property, plant and equipment    
Oil and gas properties (successful efforts method) 6,187,638us-gaap_OilAndGasPropertySuccessfulEffortMethodGross 5,966,140us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Other property and equipment 356,940us-gaap_PropertyPlantAndEquipmentOther 313,439us-gaap_PropertyPlantAndEquipmentOther
Less: accumulated depreciation, depletion, amortization and impairment (1,215,216)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net 5,329,362us-gaap_PropertyPlantAndEquipmentNet 5,186,786us-gaap_PropertyPlantAndEquipmentNet
Derivative instruments 0us-gaap_DerivativeAssetsNoncurrent 13,348us-gaap_DerivativeAssetsNoncurrent
Deferred costs and other assets 40,988us-gaap_DeferredCostsAndOtherAssets 41,671us-gaap_DeferredCostsAndOtherAssets
Total assets 5,916,937us-gaap_Assets 5,938,412us-gaap_Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY    
Accounts payable 9,339us-gaap_AccountsPayableCurrent 20,958us-gaap_AccountsPayableCurrent
Revenues and production taxes payable 210,478oas_RevenuesPayableAndProductionTaxesCurrent 209,890oas_RevenuesPayableAndProductionTaxesCurrent
Accrued liabilities 314,211us-gaap_AccruedLiabilitiesCurrent 410,379us-gaap_AccruedLiabilitiesCurrent
Accrued interest payable 24,677us-gaap_InterestPayableCurrent 49,786us-gaap_InterestPayableCurrent
Deferred income taxes 77,746us-gaap_DeferredTaxLiabilitiesCurrent 97,499us-gaap_DeferredTaxLiabilitiesCurrent
Advances from joint interest partners 5,788oas_AdvancesFromJointInterestPartnersCurrent 6,616oas_AdvancesFromJointInterestPartnersCurrent
Total current liabilities 642,239us-gaap_LiabilitiesCurrent 795,128us-gaap_LiabilitiesCurrent
Long-term debt 2,365,000us-gaap_LongTermDebtNoncurrent 2,700,000us-gaap_LongTermDebtNoncurrent
Deferred income taxes 539,146us-gaap_DeferredTaxLiabilitiesNoncurrent 526,770us-gaap_DeferredTaxLiabilitiesNoncurrent
Asset retirement obligations 42,980us-gaap_AssetRetirementObligationsNoncurrent 42,097us-gaap_AssetRetirementObligationsNoncurrent
Other liabilities 3,327us-gaap_OtherLiabilitiesNoncurrent 2,116us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 3,592,692us-gaap_Liabilities 4,066,111us-gaap_Liabilities
Commitments and contingencies (Note 14)      
Stockholders’ equity    
Common stock, $0.01 par value: 300,000,000 shares authorized; 139,619,087 and 101,627,296 shares issued at March 31, 2015 and December 31, 2014, respectively 1,372us-gaap_CommonStockValue 1,001us-gaap_CommonStockValue
Treasury stock, at cost: 397,732 and 285,677 shares at March 31, 2015 and December 31, 2014, respectively (12,191)us-gaap_TreasuryStockValue (10,671)us-gaap_TreasuryStockValue
Additional paid-in capital 1,478,336us-gaap_AdditionalPaidInCapitalCommonStock 1,007,202us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 856,728us-gaap_RetainedEarningsAccumulatedDeficit 874,769us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 2,324,245us-gaap_StockholdersEquity 1,872,301us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 5,916,937us-gaap_LiabilitiesAndStockholdersEquity $ 5,938,412us-gaap_LiabilitiesAndStockholdersEquity