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Supplemental cash flow information - Changes in Non-cash Working Capital (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Changes in non-cash working capital: |  |
Trade and other receivables | $ 22,068 | $ (37,033)
Inventories | (83,495) | (23,136)
Prepaid expenses | (5,993) | (5,702)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities | (9,403) | 103,601
Decrease (increase) in non-cash working capital | (76,823) | 37,730
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid | 81,877 | (89,445)
These changes relate to the following activities: |  |
Operating | 5,998 | (49,368)
Financing | 0 | 0
Investing | (944) | (2,347)
Changes in non-cash working capital | $ 5,054 | $ (51,715)

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