v3.20.4

Long-Term Debt - Summary of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 10, 2016
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (11,058)	$ (14,834)
Total long-term debt	633,942	632,406
Current portion of long-term debt	2,240	0
Total long-term debt, including current portion	636,182	632,406
Amortization of deferred financing costs and original issue discount	4,049	3,666	$ 3,333
Level 2
Debt Instrument [Line Items]
Estimated fair value of total long-term debt outstanding	645,700	673,800
Senior Notes
Debt Instrument [Line Items]
Amortization of deferred financing costs and original issue discount	3,800	3,400	$ 3,100
Senior Notes | 9.25% Senior Secured Notes due June 2023
Debt Instrument [Line Items]
Total long-term debt, net of current portion, before debt issuance costs and discount	$ 645,000	645,000
Debt instrument, percentage rate	9.25%			9.25%
Unamortized debt discount	$ 16,100
Debt issuance costs	9,400
Senior Notes | 6.50% Senior Notes due April 2021, net of current portion
Debt Instrument [Line Items]
Total long-term debt, net of current portion, before debt issuance costs and discount	0	$ 2,240
Current portion of long-term debt	$ 2,200
Debt instrument, percentage rate	6.50%

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