XML 150 R127.htm IDEA: XBRL DOCUMENT v3.8.0.1
Shareholders' contributions - Summary of Share Capital (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in equity [abstract]        
Total equity $ 645,131 $ 671,673 $ 527,419 $ 777,227
Employee share options exercised 39 380 1,499  
Restricted shares and units vested 0      
Purchase of own shares $ (38,367) $ (4,772) $ (319)  
Share capital (Note 22)        
Changes in equity [abstract]        
Number of shares 122,382,000 122,382,000 122,382,000 122,382,000
Total equity $ 183,573 $ 183,573 $ 183,573 $ 183,573
Employee share options exercised (in shares) 0 0 0  
Restricted shares and units vested (in shares) 0 0 0  
Purchase of own shares (in shares) 0 0 0  
Share capital and share premium        
Changes in equity [abstract]        
Total equity $ 1,092,507 $ 1,120,823 $ 1,121,247 $ 1,116,617
Employee share options exercised 50 438 1,786  
Restricted shares and units vested 4,149 3,225 3,103  
Purchase of own shares (32,515) (4,087) (259)  
Share Repurchase Program        
Changes in equity [abstract]        
Purchase of own shares $ (38,367) $ (4,772) $ (320)