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OTHER ASSETS - Schedule of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial assets:    
Restricted cash, Current $ 0 $ 0
Restricted cash, Non-current 2,035 3,079
Deferred consideration, Current 7,345 2,394
Deferred consideration, Non-current 11,289 15,639
Derivative asset, Current 0 1,287
Derivative asset, Non-current 0 0
Loan receivable From JV Partner, Current 0 0
Loan receivable From JV Partner, Non-current 8,214 0
Non-financial assets:    
Non-current value added tax receivable (note 11) 5,991 6,751
Non-current materials inventory (note 7) 2,006 3,973
Held for sale 1,431 1,418
Other current assets 8,776 5,099
Other non-current assets $ 29,535 $ 29,442