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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred tax liabilities    
Investments(1) $ 301,447sd_DeferredTaxLiabilitiesEquityInvestments [1] $ 334,331sd_DeferredTaxLiabilitiesEquityInvestments [1]
Property, plant and equipment 180,140us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 198,424us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Derivative contracts 0us-gaap_DeferredTaxLiabilitiesDerivatives 24,819us-gaap_DeferredTaxLiabilitiesDerivatives
Total deferred tax liabilities 481,587us-gaap_DeferredTaxLiabilities 557,574us-gaap_DeferredTaxLiabilities
Deferred tax assets    
Derivative contracts 3,692us-gaap_DeferredTaxAssetsDerivativeInstruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments
Allowance for doubtful accounts 20,358us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 17,713us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Net operating loss carryforwards 973,675us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 859,328us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Litigation settlement 355sd_DeferredTaxAssetsLitigationSettlement 7,200sd_DeferredTaxAssetsLitigationSettlement
Compensation and benefits 24,895us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 13,935us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Alternative minimum tax credits and other carryforwards 46,624sd_DeferredTaxAssetsAlternativeMinimumTaxAndOtherCarryforwards 42,242sd_DeferredTaxAssetsAlternativeMinimumTaxAndOtherCarryforwards
Asset retirement obligations 147,626us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations 172,229us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations
Under-delivery obligation 15,012us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Other 2,801us-gaap_DeferredTaxAssetsOther 2,193us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,235,038us-gaap_DeferredTaxAssetsGross 1,114,840us-gaap_DeferredTaxAssetsGross
Valuation allowance (753,451)us-gaap_DeferredTaxAssetsValuationAllowance (557,266)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 5 for further discussion of the Royalty Trusts.