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Shareholders' contributions - Share Capital (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Share capital and share premium      
Balance at beginning of period $ 1,028,883 [1] $ 1,108,145 [2] $ 891,197
Restricted shares and units vested 1,224 721 0
Purchase of own shares (4,365) (4,263) (15,725)
Balance at end of period $ 963,724 $ 1,028,883 [1] $ 1,108,145 [2]
Number of shares      
Number of shares      
Stock at beginning of period (shares) | shares 122,382,000 122,382,000 122,382,000
Employee share options exercised (shares) | shares     0
Restricted shares and units vested (shares) | shares 0 0 0
Purchase of own shares (shares) | shares 0 0 0
Stock at end of period (shares) | shares 122,382,000 122,382,000 122,382,000
Share capital and share premium      
Balance at beginning of period $ 183,573 $ 183,573 [2] $ 183,573
Balance at end of period 183,573 183,573 183,573 [2]
Share capital and share premium      
Share capital and share premium      
Balance at beginning of period 1,085,312 1,084,076 1,092,507
Employee share options exercised     0
Restricted shares and units vested 4,182 4,455 4,775
Purchase of own shares (3,106) (3,219) (13,206)
Balance at end of period $ 1,086,388 $ 1,085,312 $ 1,084,076
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for the classification of the adjustment of opening balance for the application of IAS 29 as explained in Note 34.