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Supplemental cash flow information - Changes in Non-cash Working Capital (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Changes in non-cash working capital: |  |
Trade and other receivables | $ (139,367) | $ 76,721
Inventories | (150,860) | (27,644)
Prepaid expenses | (2,217) | 4,059
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities | 234,998 | 107,199
Decrease (increase) in non-cash working capital | (57,446) | 160,335
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid | (31,924) | (43,259)
Changes in non-cash working capital | (89,370) | 117,076
These changes relate to the following activities: |  |
Operating | (83,109) | 64,923
Financing | 1,350 | 0
Investing | (7,611) | 52,153
Changes in non-cash working capital | $ (89,370) | $ 117,076

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