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Supplementary cash flow information - Changes in non-cash working capital (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Statement of cash flows [abstract] |  |
Accounts receivable and prepaids | $ 3,345 | $ (6,768)
Value-added and other tax receivables | 4,272 | (4,441)
Inventories | (41,186) | (58,059)
Accounts payable and accrued liabilities | 1,361 | 20,386
Current income and other taxes payable | 40,838 | 9,201
Changes in non-cash working capital | $ 8,630 | $ (39,681)

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