Finance and operating leases - Minimum lease payments and receipts (Details) - CAD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Payments Finance Leases
2025	$ 19,946
2026	15,414
2027	11,646
2028	7,048
2029 and thereafter	6,885
Total minimum lease payments	60,939
Less: amount representing interest	(6,381)
Carrying amount of minimum lease payments	54,558
Less: current portion	(17,340)
Long term	37,218
Payments Operating Leases
2025	2,382
2026	2,020
2027	1,537
2028	1,318
2029 and thereafter	9,704
Total minimum lease payments	16,961
Less: amount representing interest	(3,749)
Carrying amount of minimum lease payments	13,212
Less: current portion	(1,771)	$ (1,742)
Long term	11,441	$ 11,307
Receipts Operating Leases
2025	1,262
2026	723
2027	723
2028	723
2029 and thereafter	5,271
Total minimum lease payments	$ 8,702

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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 45
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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 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 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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