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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement of comprehensive income [abstract]    
Loss for the year $ (21,388) $ (346,876)
Other comprehensive income (loss):    
Change in fair value of available-for-sale financial assets 15,878 11,115
Income tax on change in fair value of available-for-sale financial assets (2,595) (1,428)
Reversal of unrealized gains on available-for-sale investments on acquistion of Integra, net of taxes (24,340)  
Transfer of realized loss on disposal of availabe-for-sale financial assets   4,901
Actuarial losses on defined benefit pension plans (3,121) (1,188)
Total other comprehensive income (loss) for the year (14,178) 13,400
Total comprehensive loss for the year (35,566) (333,476)
Attributable to:    
Shareholders of the Company (24,113) (330,751)
Non-controlling interests (11,453) (2,725)
Total comprehensive loss for the year $ (35,566) $ (333,476)