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Supplemental cash flow information - Changes in Non-cash Working Capital (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in non-cash working capital:    
Trade and other receivables $ 25,847 $ 22,068
Inventories 106,907 (83,495)
Prepaid expenses (5,264) (5,993)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities (123,660) (9,403)
Decrease (increase) in non-cash working capital 3,830 (76,823)
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid 17,107 81,877
These changes relate to the following activities:    
Operating 9,426 5,998
Financing 0 0
Investing 11,511 (944)
Changes in non-cash working capital $ 20,937 $ 5,054