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Debt - Schedule of Debt (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Dec. 21, 2017
Debt Instrument [Line Items]      
Principal amount of long-term debt $ 415,000,000 $ 415,000,000  
Less: unamortized discount and deferred financing costs (26,961,000) (30,188,000)  
Total debt, net of unamortized discount and deferred financing costs 388,039,000 384,812,000  
Less: current maturities 0 0  
Long-term debt, net of current maturities $ 388,039,000 384,812,000  
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 $ (17,100,000)    
Senior Notes | 7.75% Senior Secured Note due 2025      
Debt Instrument [Line Items]      
Debt instrument, interest rate 7.75%   7.75%
Principal amount of long-term debt $ 300,000,000 300,000,000 $ 300,000,000
Revolving Credit Facility | ABL Revlover      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 0 $ 0