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Leases - Supplemental balance sheet information (Details) $ in Thousands	Dec. 31, 2019 CAD ($)
Leases [Abstract]
Net book value of property, plant and equipment under finance leases	$ 139,140
Weighted-average remaining lease term (in years):
Finance leases	3 years 1 month 6 days
Operating leases	8 years 3 months 18 days
Weighted-average discount rate:
Finance leases	3.94%
Operating leases	4.80%

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Weighted Average Discount Rate [Abstract]

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- Definition

Weighted Average Lease Term [Abstract]

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Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Weighted average discount rate for operating lease calculated at point in time.

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-Publisher FASB
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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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