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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Depreciation $ 211,903us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 169,404us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Original Issue Discount on 2032 Notes 16,269us-gaap_DeferredTaxLiabilitiesFinancingArrangements 14,720us-gaap_DeferredTaxLiabilitiesFinancingArrangements
Equity investments in production facilities 50,685us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 84,870us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Prepaid and other 4,211us-gaap_DeferredTaxLiabilitiesOther 7,556us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 283,068us-gaap_DeferredTaxLiabilities 276,550us-gaap_DeferredTaxLiabilities
Deferred tax assets:    
Net operating loss (23,076)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards (40,105)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Reserves, accrued liabilities and other (53,973)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther (44,999)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Total deferred tax assets (77,049)us-gaap_DeferredTaxAssetsGross (85,104)us-gaap_DeferredTaxAssetsGross
Valuation allowance 23,076us-gaap_DeferredTaxAssetsValuationAllowance 22,860us-gaap_DeferredTaxAssetsValuationAllowance
Current deferred tax assets (31,180)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent (51,573)us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred tax liabilities 260,275us-gaap_DeferredTaxLiabilitiesNoncurrent 265,879us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities $ 229,095us-gaap_DeferredTaxAssetsLiabilitiesNet $ 214,306us-gaap_DeferredTaxAssetsLiabilitiesNet