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Income Taxes - Tax rate reconciliation (Details) - CAD ($) $ in Thousands	12 Months Ended
	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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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 change in unrecognized deferred tax assets.

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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.

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The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)]

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The applicable income tax rate.

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