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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets - current:    
Derivative instruments current, net $ 0upl_DeferredTaxAssetsDerivativeInstrumentsCurrent $ 9,636upl_DeferredTaxAssetsDerivativeInstrumentsCurrent
Incentive compensation-other, net 6,150upl_DeferredTaxAssetsOtherCurrent 7,641upl_DeferredTaxAssetsOtherCurrent
Deferred Tax Assets Valuation Allowance Net Current 0upl_DeferredTaxAssetsValuationAllowanceNetCurrent (16,778)upl_DeferredTaxAssetsValuationAllowanceNetCurrent
Net deferred tax assets - current 6,150us-gaap_DeferredTaxAssetsGrossCurrent 499us-gaap_DeferredTaxAssetsGrossCurrent
Deferred Tax Liabilities Current [Abstract]    
Derivative instruments, net 36,788upl_DeferredTaxLiabilitiesDerivativeInstrumentsCurrent 499upl_DeferredTaxLiabilitiesDerivativeInstrumentsCurrent
Deferred Tax Assets Liabilities Net Current 30,638us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Deferred tax assets - non - current [Abstract]    
Property and equipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 131,340us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred gain on sale 48,319us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction 52,045us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction
U.S. federal tax credit carryforwards 16,144us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 16,254us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
Net operating loss carryforwards 147,336us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 71,843us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
US state net operating loss carryforward 53,654us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 36,205us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Asset retirement obligations 45,039us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 26,876us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Incentive compensation/other, net 19,142us-gaap_DeferredTaxAssetsOther 13,007us-gaap_DeferredTaxAssetsOther
Deferred tax assets noncurrent before valuation allowances 329,634upl_DeferredTaxAssetsNoncurrentBeforeValuationAllowances 347,570upl_DeferredTaxAssetsNoncurrentBeforeValuationAllowances
Valuation allowance (161,480)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (346,596)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Net deferred tax assets - non-current 168,154us-gaap_DeferredTaxAssetsGrossNoncurrent 974us-gaap_DeferredTaxAssetsGrossNoncurrent
Deferred Tax Liabilities - non current [Abstract]    
Property and equipment 137,514us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other 0us-gaap_DeferredTaxLiabilitiesOther 968us-gaap_DeferredTaxLiabilitiesOther
Net non-current tax liabilities 137,514us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 968us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net non-current tax asset 30,640us-gaap_DeferredTaxAssetsLiabilitiesNet 6us-gaap_DeferredTaxAssetsLiabilitiesNet
Non-US Deferred tax liabilities - non-current    
Other - Non US $ 992upl_DeferredTaxLiabilitiesOtherNonUS $ 0upl_DeferredTaxLiabilitiesOtherNonUS