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Consolidated Balance Sheet (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 45,811us-gaap_CashAndCashEquivalentsAtCarryingValue $ 91,901us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable — oil and gas revenues 130,934us-gaap_AccountsReceivableNetCurrent 175,653us-gaap_AccountsReceivableNetCurrent
Accounts receivable — joint interest partners 175,537us-gaap_OilAndGasJointInterestBillingReceivablesCurrent 139,459us-gaap_OilAndGasJointInterestBillingReceivablesCurrent
Inventory 21,354us-gaap_InventoryNet 20,652us-gaap_InventoryNet
Prepaid expenses 14,273us-gaap_PrepaidExpenseCurrent 10,191us-gaap_PrepaidExpenseCurrent
Deferred income taxes 0us-gaap_DeferredTaxAssetsNetCurrent 6,335us-gaap_DeferredTaxAssetsNetCurrent
Derivative instruments 302,159us-gaap_DerivativeAssetsCurrent 2,264us-gaap_DerivativeAssetsCurrent
Advances to joint interest partners 13oas_AdvancesToJointInterestPartnersCurrent 760oas_AdvancesToJointInterestPartnersCurrent
Other current assets 6,526us-gaap_OtherAssetsCurrent 391us-gaap_OtherAssetsCurrent
Total current assets 696,607us-gaap_AssetsCurrent 447,606us-gaap_AssetsCurrent
Property, plant and equipment    
Oil and gas properties (successful efforts method) 5,966,140us-gaap_OilAndGasPropertySuccessfulEffortMethodGross 4,528,958us-gaap_OilAndGasPropertySuccessfulEffortMethodGross
Other property and equipment 313,439us-gaap_PropertyPlantAndEquipmentOther 188,468us-gaap_PropertyPlantAndEquipmentOther
Less: accumulated depreciation, depletion, amortization and impairment (1,092,793)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (637,676)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net 5,186,786us-gaap_PropertyPlantAndEquipmentNet 4,079,750us-gaap_PropertyPlantAndEquipmentNet
Assets held for sale 0us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets 137,066us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssets
Derivative instruments 13,348us-gaap_DerivativeAssetsNoncurrent 1,333us-gaap_DerivativeAssetsNoncurrent
Deferred costs and other assets 41,671us-gaap_DeferredCostsAndOtherAssets 46,169us-gaap_DeferredCostsAndOtherAssets
Total assets 5,938,412us-gaap_Assets 4,711,924us-gaap_Assets
Current liabilities    
Accounts payable 20,958us-gaap_AccountsPayableCurrent 8,920us-gaap_AccountsPayableCurrent
Revenues and production taxes payable 209,890oas_RevenuesPayableAndProductionTaxesCurrent 146,741oas_RevenuesPayableAndProductionTaxesCurrent
Accrued liabilities 410,379us-gaap_AccruedLiabilitiesCurrent 241,830us-gaap_AccruedLiabilitiesCurrent
Accrued interest payable 49,786us-gaap_InterestPayableCurrent 47,910us-gaap_InterestPayableCurrent
Derivative instruments 0us-gaap_DerivativeLiabilitiesCurrent 8,188us-gaap_DerivativeLiabilitiesCurrent
Deferred income taxes 97,499us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Advances from joint interest partners 6,616oas_AdvancesFromJointInterestPartnersCurrent 12,829oas_AdvancesFromJointInterestPartnersCurrent
Total current liabilities 795,128us-gaap_LiabilitiesCurrent 466,418us-gaap_LiabilitiesCurrent
Long-term debt 2,700,000us-gaap_LongTermDebtNoncurrent 2,535,570us-gaap_LongTermDebtNoncurrent
Deferred income taxes 526,770us-gaap_DeferredTaxLiabilitiesNoncurrent 323,147us-gaap_DeferredTaxLiabilitiesNoncurrent
Asset retirement obligations 42,097us-gaap_AssetRetirementObligationsNoncurrent 35,918us-gaap_AssetRetirementObligationsNoncurrent
Derivative instruments 0us-gaap_DerivativeLiabilitiesNoncurrent 139us-gaap_DerivativeLiabilitiesNoncurrent
Other liabilities 2,116us-gaap_OtherLiabilitiesNoncurrent 2,183us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 4,066,111us-gaap_Liabilities 3,363,375us-gaap_Liabilities
Commitments and contingencies      
Stockholders’ equity    
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,627,296 shares and 100,866,589 shares issued at December 31, 2014 and 2013, respectively 1,001us-gaap_CommonStockValue 996us-gaap_CommonStockValue
Treasury stock, at cost: 285,677 shares and 167,155 shares at December 31, 2014 and 2013, respectively (10,671)oas_TreasuryStockCost (5,362)oas_TreasuryStockCost
Additional paid-in-capital 1,007,202us-gaap_AdditionalPaidInCapitalCommonStock 985,023us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 874,769us-gaap_RetainedEarningsAccumulatedDeficit 367,892us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 1,872,301us-gaap_StockholdersEquity 1,348,549us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 5,938,412us-gaap_LiabilitiesAndStockholdersEquity $ 4,711,924us-gaap_LiabilitiesAndStockholdersEquity