Capital disclosures (Details) $ in Thousands	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2016 CAD ($)
Disclosure Of Capital Disclosures [Abstract]
Long-term debt	$ 1,796,207	$ 1,270,330	$ 1,362,192
Current liabilities	563,199	363,306
Current assets	(429,877)	(261,846)
Net debt	$ 1,929,529	$ 1,371,790
Ratio of net debt to fund flows from operations	2.30	2.28

The amount of assets that the entity (a) expects to realise or intends to sell or consume in its normal operating cycle; (b) holds primarily for the purpose of trading; (c) expects to realise within twelve months after the reporting period; or (d) classifies as cash or cash equivalents (as defined in IAS 7) unless the asset is restricted from being exchanged or used to settle a liability for at least twelve months after the reporting period. [Refer: Assets]

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