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Share capital (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Mar. 31, 2020
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 08, 2019
Equity, Class of Treasury Stock [Line Items]              
Share repurchase program     $ 175,000        
Ordinary Shares              
Equity, Class of Treasury Stock [Line Items]              
Issue of shares associated with a business combination (in shares)   27,372,427          
Share repurchase program     $ 82        
Shares redeemed (in shares)     1,235,218        
Buyback Program              
Equity, Class of Treasury Stock [Line Items]              
Share repurchase program, number of shares authorized to be repurchased (in shares)             1,000,000
Share repurchase program $ 5,300       $ 175,000 $ 141,600  
Shares redeemed (in shares) 35,100     0 1,235,218    
Buyback Program | Maximum              
Equity, Class of Treasury Stock [Line Items]              
Share repurchase program, authorized percentage       10.00%