Long-term debt, net - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 360,000	$ 294,000
Debt issuance cost on Second Lien Notes, net	2,528	3,211
Discount on Second Lien Notes, net	1,961	2,491
Total debt issuance cost and discounts	4,489	5,702
Total long-term debt, net	355,511	288,298
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Total debt	260,000	194,000
Second Lien Notes | Senior Notes
Debt Instrument [Line Items]
Total debt	$ 100,000	$ 100,000