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Supplementary cash flow information - Non-cash (credits) charges (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement of cash flows [abstract] |  |
Depreciation and depletion | $ 306,429 | $ 160,469
Delivery into prepaid sales (Note 13) | (60,000) | (60,000)
Share-based payments (Note 12) | 21,693 | 18,127
Impairment of long-lived assets, net (Note 8) | 55,353 | 0
Gain on sale of Lynn Lake royalty (Note 8) | 0 | (6,593)
Write-down of mineral property interests (Note 8) | 9,398 | 4,150
Provision for non-recoverable input taxes | 1,646 | 2,180
Unrealized (gain) loss on fair value of convertible notes (Note 10) | (10,651) | 11,144
Interest and financing expense | 28,589 | 9,728
Unrealized loss (gain) on derivative instruments (Note 14) | 4,757 | (9,684)
Write-down of long-term investments | 0 | 1,613
Deferred income tax expense (recovery) (Note 16) | 38,392 | (20,170)
Other | 657 | (1,146)
Non-cash (credits) charges | $ 396,263 | $ 109,818

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- Definition Adjustments for deferred tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deferred tax expense (income); Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 + Details
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