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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Dec. 21, 2017
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 415,000	$ 415,000
Less: unamortized discount and deferred financing costs	(25,402)	(30,188)
Total debt, net of unamortized discount and deferred financing costs	389,598	384,812
Less: current maturities	0	0
Long-term debt, net of current maturities	$ 389,598	384,812
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	115,000
Less: unamortized discount and deferred financing costs	$ (15,900)
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	300,000	$ 300,000
Revolving Credit Facility \| ABL Revlover
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 0	$ 0