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Provision (Benefit) for Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
DTA, Federal net operating losses (NOLs) $ 141,896us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic $ 117,713us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
DTA, NOLs for excess stock-based compensation (9,606)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther (9,615)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
DTA, State NOL carryovers 15,525us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 14,626us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
DTA, Alternative minimum tax credits 2,092us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 2,092us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
DTA, Other Loss Carryforwards 1,294us-gaap_DeferredTaxAssetsOtherLossCarryforwards 1,295us-gaap_DeferredTaxAssetsOtherLossCarryforwards
DTA, ARO 26,388us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 28,628us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
DTA, Unrealized share-based compensation 9,471us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 9,957us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
DTA, Valuation Allowance (11,327)us-gaap_DeferredTaxAssetsValuationAllowance (6,703)us-gaap_DeferredTaxAssetsValuationAllowance
DTA, Other 4,056us-gaap_DeferredTaxAssetsOther 6,042us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 179,789us-gaap_DeferredTaxAssetsGross 164,035us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Deferred Tax Liabilities, Property, Plant and Equipment (258,326)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (393,606)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Other (1,596)us-gaap_DeferredTaxLiabilitiesOther (919)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross 259,922us-gaap_DeferredIncomeTaxLiabilities 394,525us-gaap_DeferredIncomeTaxLiabilities
Total deferred tax liabilities (80,133)us-gaap_DeferredTaxLiabilities (230,490)us-gaap_DeferredTaxLiabilities
Net current deferred tax assets 6,243us-gaap_DeferredTaxAssetsNetCurrent 10,715us-gaap_DeferredTaxAssetsNetCurrent
Net non-current deferred tax liabilities $ (86,376)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (241,205)us-gaap_DeferredTaxLiabilitiesNoncurrent