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Long Term Obligations - Term Loan (Details) - Senior Secured Term Loan - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Jul. 31, 2014
Debt Instrument [Line Items]      
Face amount of term loan   $ 300,000,000  
Gains (losses) on extinguishment of debt $ (2,200,000)    
Interest rate (percent)   6.20% 7.20%
Unamortized discount on term loan   $ 5,300,000  
Minimum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate (percent)   5.00%