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Supplementary Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Increase (Decrease) in Operating Capital [Abstract]    
Accounts receivable $ 1,161 $ (3,986)
Other receivables (2,336) (7,681)
Prepaids and other assets 1,568 (2,564)
Inventory (23,913) (15,105)
Accounts payable and other liabilities (6,985) 9,877
Cumulative effect from foreign exchange (65) (2,132)
Total $ (30,570) $ (21,591)