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Shareholders' contributions - Share Capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 17, 2022
May 17, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share capital and share premium          
Balance at beginning of period     $ 1,047,830 $ 963,724 $ 1,028,883
Employee share options exercised     2,124    
Restricted shares granted and units vested     1,824 448 1,224
Purchase of own shares     (36,844) (66,463) (4,365)
Dividends paid to shareholders $ (17,500) $ (17,500)   (298) (2,460)
Balance at end of period     $ 1,163,643 $ 1,047,830 $ 963,724
Number of shares          
Number of shares          
Stock at beginning of period (shares)     122,382,000 122,382,000 122,382,000
Reduction of issued share capital of the company (in shares)     (11,000,000)    
Stock at end of period (shares)     111,382,000 122,382,000 122,382,000
Share capital and share premium          
Balance at beginning of period     $ 183,573 $ 183,573 $ 183,573
Balance at end of period     167,073 183,573 183,573
Share capital and share premium          
Share capital and share premium          
Balance at beginning of period     1,034,633 1,086,388 1,085,312
Reduction of issued share capital of the company     (16,500)    
Employee share options exercised     2,432    
Restricted shares granted and units vested       3,594 4,182
Restricted shares granted     4,647    
Purchase of own shares     (29,970) (55,349) (3,106)
Dividends paid to shareholders     (35,000)    
Balance at end of period     $ 960,242 $ 1,034,633 $ 1,086,388