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Long-term debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized debt issuance expense	$ (926)	$ (1,154)
Total long-term debt, net	124,074	123,846
5.50% Senior Secured Notes
Debt Instrument [Line Items]
Long-term debt gross	$ 125,000	$ 125,000

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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