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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]    
Short-term benefits $ 10,175 $ 10,052
Share-based payments 2,235 2,172
Key management personnel compensation 12,410 12,224
Company owned by a former director [member]    
Disclosure of transactions between related parties [line items]    
Consulting services $ 0 $ 100