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Supplementary Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Operating Capital [Abstract]      
Accounts receivable $ (4,724) $ (702) $ (2,569)
Prepaids and other receivables (5,300) (10,509) (2,382)
Current portion of loans receivable 0 (4,585) 0
Inventory (28,094) (51,888) (4,092)
Accounts payable and other liabilities 4,175 13,476 12,705
Total $ (33,943) $ (54,208) $ 3,662