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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization $ 59,562us-gaap_DeferredFinanceCostsNoncurrentNet $ 61,923us-gaap_DeferredFinanceCostsNoncurrentNet
Investments 12,030us-gaap_MarketableSecuritiesNoncurrent 13,708us-gaap_MarketableSecuritiesNoncurrent
Deferred tax asset 6,987us-gaap_DeferredTaxAssetsGrossNoncurrent 0us-gaap_DeferredTaxAssetsGrossNoncurrent
Restricted deposits(1) 0us-gaap_RestrictedCashAndInvestmentsNoncurrent [1] 27,955us-gaap_RestrictedCashAndInvestmentsNoncurrent [1]
Notes receivable on asset retirement obligations(1) 0us-gaap_NotesAndLoansReceivableNetNoncurrent [1] 11,640us-gaap_NotesAndLoansReceivableNetNoncurrent [1]
Other 3,459us-gaap_OtherAssetsMiscellaneousNoncurrent 5,945us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets $ 82,038us-gaap_OtherAssetsNoncurrent $ 121,171us-gaap_OtherAssetsNoncurrent
[1] Assets reflected at December 31, 2013 were included in the sale of the Gulf Properties in February 2014, as discussed in Note 3.