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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization $ 53,904us-gaap_DeferredFinanceCostsNoncurrentNet $ 56,445us-gaap_DeferredFinanceCostsNoncurrentNet
Deferred tax asset 64,517us-gaap_DeferredTaxAssetsGrossNoncurrent 95,843us-gaap_DeferredTaxAssetsGrossNoncurrent
Investments 11,679us-gaap_MarketableSecuritiesNoncurrent 11,106us-gaap_MarketableSecuritiesNoncurrent
Other 648us-gaap_OtherAssetsMiscellaneousNoncurrent 1,853us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets $ 130,748us-gaap_OtherAssetsNoncurrent $ 165,247us-gaap_OtherAssetsNoncurrent