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Income Taxes - Deferred Income Tax Liability Presentation (Details) - CAD CAD in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Deferred income tax assets (Note 10)	CAD 24,000	CAD 53,000
Deferred tax liabilities	(549,000)	(712,000)
Net deferred tax liabilities	CAD (525,000)	CAD (659,000)

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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