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Financial Instruments (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Beginning balance $ 516,001 $ 550,937
Ending balance 488,013 516,001
Level 3 [member]    
Beginning balance 3,122 12,242
Disposal-capital reduction of investment (29) (9,120)
Reclassified from equity method investments 6,136  
Recognized in other comprehensive income (702)  
Recognized in profit or loss 2,032  
Ending balance 10,559 3,122
Financial assets at fair value through profit or loss [member] | Level 3 [member]    
Beginning balance 1,600 10,562
Disposal-capital reduction of investment 0 (8,962)
Reclassified from equity method investments 6,136  
Recognized in other comprehensive income 0  
Recognized in profit or loss 2,032  
Ending balance 9,768 1,600
Financial assets at fair value through other comprehensive income [member] | Level 3 [member]    
Beginning balance 1,522 1,680
Disposal-capital reduction of investment (29) (158)
Reclassified from equity method investments 0  
Recognized in other comprehensive income (702)  
Recognized in profit or loss 0  
Ending balance $ 791 $ 1,522