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Long-term debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 11, 2020
Dec. 31, 2019
Apr. 30, 2017
Sep. 27, 2013
Debt Instrument [Line Items]          
Finance lease obligations $ 5,941   $ 5,419    
Other long-term borrowings 10,199   13,284    
Subtotal 786,087   631,772    
Deferred financing costs (4,641)   (3,397)    
Total 776,574   626,808    
Current portion of long-term debt 3,129   3,233    
Long-term debt, excluding current portion 773,445   623,575    
2027 Notes          
Debt Instrument [Line Items]          
Notes payable 553,354   265,000    
Discount on Notes (7,358)   0    
Premium on Notes 3,206   0    
Deferred financing costs   $ (2,000)   $ (3,001)  
2023 Notes          
Debt Instrument [Line Items]          
Notes payable 216,593   348,069    
Discount on Notes (1,147)   (2,504)    
Premium on Notes $ 427   $ 937    
Deferred financing costs         $ (3,313)