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Income Taxes - Tax rate reconciliation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract] |  |
Earnings (loss) before income taxes and non-controlling interest | $ 39,929 | $ (207,237)
Combined federal and provincial tax rate | 26.90% | 26.70%
Computed income tax expense (recovery) | $ 10,741 | $ (55,332)
Increase Decrease In Taxes Abstract |  |
Difference between Canadian rates and rates applicable to subsidiaries in other countries | (78,138) | (51,526)
Change in unrecognized deferred tax assets | 18,027 | 70,353
Share-based compensation plans | 1,292 | 1,349
Change in tax provision related to transfer pricing | (61,000) | 3,000
Non-deductible (non-taxable) capital amounts | (13,249) | 3,034
Change in legislation | 0 | (12,199)
Non-deductible goodwill impairment | 0 | 35,520
Change in uncertain tax positions | (3,517) | 0
Other permanent differences | (462) | 3,282
Income tax recovery | $ (126,306) | $ (2,519)

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- Definition The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to NonDeductibleCapitalAmounts. + References No definition available. + Details
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- Definition The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to OtherPermanentDifferences. + References No definition available. + Details
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- Definition The amount representing the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to share based compensation plans. + References No definition available. + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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