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OTHER ASSETS - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial assets:    
Restricted cash, Current $ 0 $ 0
Restricted cash, Non-current 3,079 3,061
Deferred consideration, Current 2,394 2,720
Deferred consideration, Non-current 15,639 8,335
Derivative asset, Current 1,287 0
Derivative asset, Non-current 0 0
Non-financial assets:    
Non-current value added tax receivables 6,751 6,531
Non-current materials and supplies (note 8) 3,973 1,811
Other current assets 3,681 2,720
Other non-current assets $ 29,442 $ 19,738