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Income Taxes - Deferred Income Tax Liability Presentation (Details) - CAD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Deferred income tax assets (Note 11)	$ 28,000	$ 24,000
Deferred tax liabilities	(501,000)	(549,000)
Net deferred tax liabilities	$ (473,000)	$ (525,000)

X

- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

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Income Taxes [Abstract]

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