Debt - Summary of Detail Comprising Debt and Related Book Values (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt, before discount and deferred financing cost	$ 1,007,719	$ 746,928
Discount and deferred financing cost	(10,678)	(13,947)
Total debt, net of discount and deferred financing costs	997,041	732,981
Senior Notes | 11.00% Second-Priority Senior Secured Notes – due April 2022
Debt Instrument [Line Items]
Total debt, before discount and deferred financing cost	351,659	390,868
Senior Notes | 7.50% Senior Notes – due May 2022
Debt Instrument [Line Items]
Total debt, before discount and deferred financing cost	6,060	6,060
Bank Credit Facility | Bank Credit Facility – matures May 2022
Debt Instrument [Line Items]
Total debt, before discount and deferred financing cost	$ 650,000	$ 350,000