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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization(1) $ 61,923us-gaap_DeferredFinanceCostsNoncurrentNet [1] $ 83,643us-gaap_DeferredFinanceCostsNoncurrentNet [1]
Restricted deposits 27,955us-gaap_RestrictedCashAndInvestmentsNoncurrent 27,947us-gaap_RestrictedCashAndInvestmentsNoncurrent
Notes receivable on asset retirement obligations 11,640us-gaap_NotesAndLoansReceivableNetNoncurrent 11,433us-gaap_NotesAndLoansReceivableNetNoncurrent
Investments 13,708us-gaap_MarketableSecuritiesNoncurrent 10,348us-gaap_MarketableSecuritiesNoncurrent
Other 5,945us-gaap_OtherAssetsMiscellaneousNoncurrent 10,881us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets $ 121,171us-gaap_OtherAssetsNoncurrent $ 144,252us-gaap_OtherAssetsNoncurrent
[1] In 2013, the unamortized debt issuance costs associated with the 9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018 were written off at the time the Company redeemed these notes. See Note 13 for discussion of the senior note redemptions.