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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]    
Short-term benefits $ 13,863 $ 10,175
Share-based payments 2,446 2,235
Key management personnel compensation $ 16,309 $ 12,410