Finance and operating leases - Minimum lease payments and receipts (Details) - CAD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Payments Finance Leases
2024	$ 25,697
2025	14,307
2026	9,721
2027	6,094
2028 and thereafter	2,081
Total minimum lease payments	57,900
Less: amount representing interest	(5,049)
Carrying amount of minimum lease payments	52,851
Less: current portion	(23,691)
Long term	29,160
Payments Operating Leases
2024	2,307
2025	1,727
2026	1,579
2027	1,381
2028 and thereafter	9,358
Total minimum lease payments	16,352
Less: amount representing interest	(3,303)
Carrying amount of minimum lease payments	13,049
Less: current portion	(1,742)	$ (2,470)
Long term	11,307	$ 12,376
Receipts Operating Leases
2024	683
2025	0
2026	0
2027	0
2028 and thereafter	0
Total minimum lease payments	$ 683

Finance Lease, Liability, To Be Paid, After Year Four

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Lessee, Operating Lease, Liability, To Be Paid, After Year Four

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Lessor, Operating Lease, Payment To Be Received, After Year Four

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Receipts Operating Leases [Abstract]

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-6

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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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-Topic 842
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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Amount of lease payments to be received by lessor for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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