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Debt - Schedule of Debt (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Principal amount of long-term debt $ 415,000,000 $ 415,000,000
Less: unamortized discount and deferred financing costs (28,500,000) (30,188,000)
Total debt, net of unamortized discount and deferred financing costs 386,500,000 384,812,000
Less: current maturities 0 0
Long-term debt, net of current maturities $ 386,500,000 384,812,000
5.00% Convertible Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate 5.00%  
7.75% Senior Secured Note due 2025    
Debt Instrument [Line Items]    
Debt instrument, interest rate 7.75%  
Convertible Debt | 5.00% Convertible Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate 5.00%  
Principal amount of long-term debt $ 115,000,000 115,000,000
Less: unamortized discount and deferred financing costs (18,300,000)  
Revolving Credit Facility | ABL Revlover    
Debt Instrument [Line Items]    
Line of credit facility, amount outstanding $ 0 $ 0