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SUPPLEMENTAL CASH FLOW INFORMATION - Changes in Working Capital Items (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash Flow Statement [Abstract]    
Trade and other receivables $ 23,232 $ (14,255)
Inventory (10,973) 16,291
Trade and other payables (10,117) 5,680
Provisions (7,028) 1,470
Change in working capital $ (4,886) $ 9,186