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