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Long-term Obligations - Term Loan (Details) - Senior Secured Term Loan - USD ($)
1 Months Ended
Jul. 31, 2014
Dec. 31, 2015
Debt Instrument [Line Items]    
Face amount of term loan $ 300,000,000  
Interest rate, stated percentage 7.20% 6.20%
Unamortized discount on term loan $ 5,300,000  
LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate (percent) 5.00%