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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, 2020 | Dec. 31, 2019
Changes in non-cash working capital: |  |
Trade and other receivables | $ 76,721 | $ 25,847
Inventories | (27,644) | 106,907
Prepaid expenses | 4,059 | (5,264)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities | 107,199 | (123,660)
Decrease (increase) in non-cash working capital | 160,335 | 3,830
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid | (43,259) | 17,107
These changes relate to the following activities: |  |
Operating | 64,923 | 9,426
Investing | 52,153 | 11,511
Changes in non-cash working capital | $ 117,076 | $ 20,937

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