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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax liabilities      
Investments $ 272,902sd_DeferredTaxLiabilitiesEquityInvestments [1] $ 301,447sd_DeferredTaxLiabilitiesEquityInvestments [1]  
Property, plant and equipment 364,576us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 180,140us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Derivative contracts 113,735us-gaap_DeferredTaxLiabilitiesDerivatives 0us-gaap_DeferredTaxLiabilitiesDerivatives  
Total deferred tax liabilities 751,213us-gaap_DeferredTaxLiabilities 481,587us-gaap_DeferredTaxLiabilities  
Deferred tax assets      
Derivative contracts 0us-gaap_DeferredTaxAssetsDerivativeInstruments 3,692us-gaap_DeferredTaxAssetsDerivativeInstruments  
Allowance for doubtful accounts 19,086us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 20,358us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Net operating loss carryforwards 1,265,458us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 973,675us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Compensation and benefits 19,867us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 24,895us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits  
Alternative minimum tax credits and other carryforwards 43,840sd_DeferredTaxAssetsAlternativeMinimumTaxAndOtherCarryforwards 46,624sd_DeferredTaxAssetsAlternativeMinimumTaxAndOtherCarryforwards  
Asset retirement obligations 21,946us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 147,626us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations  
CO2 under-delivery shortfall penalty 27,674us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 15,012us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Other 2,934us-gaap_DeferredTaxAssetsOther 3,156us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 1,400,805us-gaap_DeferredTaxAssetsGross 1,235,038us-gaap_DeferredTaxAssetsGross  
Valuation allowance (649,592)us-gaap_DeferredTaxAssetsValuationAllowance (753,451)us-gaap_DeferredTaxAssetsValuationAllowance (557,300)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liability $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet  
[1] Includes the Company’s deferred tax liability resulting from its investment in the Royalty Trusts. See Note 4 for further discussion of the Royalty Trusts.