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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization $ 56,445us-gaap_DeferredFinanceCostsNoncurrentNet [1] $ 61,923us-gaap_DeferredFinanceCostsNoncurrentNet [1]
Deferred tax asset 95,843us-gaap_DeferredTaxAssetsGrossNoncurrent 0us-gaap_DeferredTaxAssetsGrossNoncurrent
Restricted deposits 0us-gaap_RestrictedCashAndInvestmentsNoncurrent [2] 27,955us-gaap_RestrictedCashAndInvestmentsNoncurrent [2]
Notes receivable on asset retirement obligations 0us-gaap_NotesAndLoansReceivableNetNoncurrent [2] 11,640us-gaap_NotesAndLoansReceivableNetNoncurrent [2]
Investments 11,106us-gaap_MarketableSecuritiesNoncurrent 13,708us-gaap_MarketableSecuritiesNoncurrent
Other 1,853us-gaap_OtherAssetsMiscellaneousNoncurrent 5,945us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets $ 165,247us-gaap_OtherAssetsNoncurrent $ 121,171us-gaap_OtherAssetsNoncurrent
[1] Unamortized debt issuance costs associated with the 9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018 were written off in March 2013 when the Company redeemed these notes. See Note 12 for discussion of the senior note redemptions.
[2] Assets at December 31, 2013 were included in the sale of the Gulf Properties in February 2014, as discussed in Note 3.