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Shareholders' contributions - Share Capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share capital and share premium      
Balance at beginning of period $ 1,108,145 [1] $ 683,019 $ 712,304
Employee share options exercised     39
Restricted shares and units vested 721    
Purchase of own shares (4,263) (15,725) (38,367)
Balance at end of period $ 1,028,883 $ 1,108,145 [1] $ 683,019
Share capital (Note 23)      
Number of shares      
Stock at beginning of period (shares) 122,382,000 122,382,000 122,382,000
Employee share options exercised (shares)     0
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 [1] $ 183,573 $ 183,573
Balance at end of period 183,573 183,573 [1] 183,573
Share capital and share premium      
Share capital and share premium      
Balance at beginning of period 1,084,076 1,092,507 1,120,823
Employee share options exercised     50
Restricted shares and units vested 4,455 4,775 4,149
Purchase of own shares (3,219) (13,206) (32,515)
Balance at end of period $ 1,085,312 $ 1,084,076 $ 1,092,507
[1] Net of 139,223 of Income tax.