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Long-term debt - Senior Unsecured Exchangeable Notes (Details) - 3.75% Exchangeable Senior Unsecured Notes - Exchangeable Notes - USD ($)
$ / shares in Units, $ in Thousands
May 22, 2023
Dec. 21, 2020
Dec. 31, 2020
Debt Instrument [Line Items]      
Face value of debt   $ 201,250  
Interest rate   3.75%  
Proceeds from issuance of debt $ 253,139 $ 15,536  
Debt instrument effective interest rate   4.50%  
Shares issued for debt conversion (in shares)   15,474,817  
Initial exchange price per share (in dollars per share)   $ 13.01  
Common share maximum capped price to exercise capped call (in dollars per share)   $ 17.85  
Fair Value      
Debt Instrument [Line Items]      
Proceeds from issuance of debt   $ 195,000  
Residual Value      
Debt Instrument [Line Items]      
Proceeds from issuance of debt   $ 6,250  
Minimum      
Debt Instrument [Line Items]      
Percentage of eligible share price for exchangeable notes     130.00%
Maximum      
Debt Instrument [Line Items]      
Percentage of eligible trading price per share for exchangeable notes     98.00%