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Long-term Obligations - Term Loan (Details) - USD ($)
1 Months Ended
Oct. 31, 2015
Jul. 31, 2014
Sep. 30, 2015
Senior Secured Term Loan      
Debt Instrument [Line Items]      
Face amount of term loan   $ 300,000,000  
Interest rate, stated percentage   7.20%  
Contingent interest rate (percent)   6.20%  
Unamortized discount on term loan   $ 5,300,000 $ 5,200,000
Senior Secured Term Loan Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 200,000,000  
Minimum | Senior Secured Term Loan | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate (percent)   5.00%  
Subsequent Event | Senior Secured Term Loan      
Debt Instrument [Line Items]      
Amount of principal repayment on quarterly installment payments from October 1, 2016 through maturity $ 75,000,000    
Debt instrument, repayment provision, period over which present value of interest payments is determined (in years) 2 years