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Income Taxes - Tax rate reconciliation (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]
Earnings (loss) before income taxes and non-controlling interest	$ 135,018	$ 39,929
Combined federal and provincial tax rate	26.90%	26.90%
Computed income tax expense (recovery)	$ 36,320	$ 10,741
Increase Decrease In Taxes Abstract
Difference between Canadian rates and rates applicable to subsidiaries in other countries	5,558	(78,138)
Change in unrecognized deferred tax assets	19,646	18,027
Share-based compensation plans	1,146	1,292
Change in tax provision related to transfer pricing	0	(61,000)
Non-deductible (non-taxable) capital amounts	0	(13,249)
Income in equity-accounted investee	(12,074)	0
Change in uncertain tax positions	2,572	(3,517)
Other permanent differences	7,909	(462)
Income tax expense (recovery)	$ 61,077	$ (126,306)

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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 NonDeductibleCapitalAmounts.

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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 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.

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

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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 foreign tax rates. [Refer: Accounting profit]

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