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Shareholders' contributions - Share Capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share capital and share premium      
Balance at beginning of period $ 963,724 $ 1,028,883 $ 1,108,145
Restricted shares and units vested 448 1,224 721
Purchase of own shares (66,463) (4,365) (4,263)
Balance at end of period $ 1,047,830 $ 963,724 $ 1,028,883
Number of shares      
Number of shares      
Stock at beginning of period (shares) 122,382,000 122,382,000 122,382,000
Restricted shares and units vested (shares) 0 0 0
Purchase of own shares (shares) 0 0 0
Stock at end of period (shares) 122,382,000 122,382,000 122,382,000
Share capital and share premium      
Balance at beginning of period $ 183,573 $ 183,573 $ 183,573
Balance at end of period 183,573 183,573 183,573
Share capital and share premium      
Share capital and share premium      
Balance at beginning of period 1,086,388 1,085,312 1,084,076
Restricted shares and units vested 3,594 4,182 4,455
Purchase of own shares (55,349) (3,106) (3,219)
Balance at end of period $ 1,034,633 $ 1,086,388 $ 1,085,312