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Long-term Debt - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Aggregate outstanding principal $ 2,372,218 $ 2,371,362
Debt issuance cost $ 27,800  
Senior Notes [Member]    
Debt Instrument [Line Items]    
Redemption prices, percent of outstanding principal 101.00%