Long-Term Debt - Summary of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 10, 2016	Apr. 30, 2016
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (14,834)	$ (18,251)
Total long-term debt	632,406	628,989
Amortization of deferred financing costs and original issue discount	3,666	3,333	$ 3,046
Level 2
Debt Instrument [Line Items]
Fair value of debt	673,800	670,800
Senior Notes | 9.25% Senior Secured Notes due June 2023
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 645,000	645,000
Debt instrument, percentage rate	9.25%			9.25%	9.25%
Unamortized debt discount	$ 16,100
Debt issuance costs	9,400
Senior Notes | 6.50% Senior Notes, due 2021
Debt Instrument [Line Items]
Total long-term debt, before debt issuance costs and discount	$ 2,240	$ 2,240	$ 2,200
Debt instrument, percentage rate	6.50%					6.50%