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Long-term debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Sep. 11, 2020
Apr. 30, 2017
Sep. 27, 2013
Debt Instrument [Line Items]          
Finance lease obligations $ 6,139 $ 5,941      
Other long-term borrowings 7,509 10,199      
Subtotal 751,397 786,087      
Deferred financing costs (3,659) (4,641)      
Total 743,958 776,574      
Current portion of long-term debt 4,741 3,129      
Long-term debt, excluding current portion 739,217 773,445      
2027 Notes          
Debt Instrument [Line Items]          
Notes payable 535,986 553,354      
Discount on notes (5,960) (7,358)      
Premium on notes 2,613 3,206      
Deferred financing costs     $ (2,000) $ (3,001)  
2023 Notes          
Debt Instrument [Line Items]          
Notes payable 201,763 216,593      
Discount on notes (687) (1,147)      
Premium on notes $ 254 $ 427      
Deferred financing costs         $ (3,313)