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Long-term debt - Principal Outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Principal outstanding $ 751,397  
2027 Notes    
Debt Instrument [Line Items]    
Annual interest rate 5.875%  
Principal outstanding $ 535,986 $ 553,354
2023 Notes    
Debt Instrument [Line Items]    
Annual interest rate 6.625%  
Principal outstanding $ 201,763 $ 216,593