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Other Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Debt issuance costs, net of amortization $ 83,065 $ 56,445
Deferred tax asset 52,763 95,843
Investments 10,882 11,106
Other 632 1,853
Total other assets $ 147,342 $ 165,247