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Supplemental cash flow information - Changes in Non-cash Working Capital (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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