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Shareholders' contributions - Summary of Share Capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share capital and share premium      
Equity, beginning balance $ 683,019 [1],[2] $ 712,304 [2],[3] $ 564,150
Employee share options exercised   39 380
Restricted shares and units vested 0    
Purchase of own shares (15,725) (38,367) (4,772)
Equity, ending balance $ 1,108,145 $ 683,019 [1],[2] $ 712,304 [2],[3]
Share capital (Note 22)      
Number of shares      
Number of shares (in shares) 122,382,000 122,382,000 122,382,000
Employee share options exercised (in shares)   0 0
Restricted shares and units vested (in shares) 0 0 0
Purchase of own shares (in shares) 0 0 0
Number of shares (in shares) 122,382,000 122,382,000 122,382,000
Share capital and share premium      
Equity, beginning balance $ 183,573 [1] $ 183,573 [3] $ 183,573
Equity, ending balance 183,573 183,573 [1] 183,573 [3]
Share capital and share premium      
Share capital and share premium      
Equity, beginning balance 1,092,507 1,120,823 1,121,247
Employee share options exercised   50 438
Restricted shares and units vested 4,775 4,149 3,225
Purchase of own shares (13,206) (32,515) (4,087)
Equity, ending balance $ 1,084,076 $ 1,092,507 $ 1,120,823
[1] 2017 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[2] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.
[3] 2016 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.