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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, 2017 | Dec. 31, 2016
Changes in non-cash working capital: |  |
Trade and other receivables | $ (37,033) | $ 4,747
Inventories | (23,136) | (28,094)
Prepaid expenses | (5,702) | (1,286)
Trade, other payables and accrued liabilities, including long-term payables included in other long-term liabilities | 103,601 | 14,577
Decrease (increase) in non-cash working capital | 37,730 | (10,056)
Adjustments for items not having a cash effect and working capital changes relating to taxes and interest paid | (89,445) | (65,850)
These changes relate to the following activities: |  |
Operating | (49,368) | (87,644)
Financing | 0 | 0
Investing | (2,347) | 11,738
Changes in non-cash working capital | $ (51,715) | $ (75,906)

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