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SUPPLEMENTAL CASH FLOW INFORMATION - Changes in Working Capital Items (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash Flow Statement [Abstract]    
Trade and other receivables $ (4,234) $ 23,232
Inventory (40,144) (10,973)
Trade and other payables 18,753 (10,117)
Provisions (5,309) (7,028)
Change in working capital $ (30,934) $ (4,886)