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Property. plant and equipment (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | $ 776,801 | $ 651,504
Owned assets, accumulated depreciation | 259,039 | 202,915
Owned assets, net book value | 517,762 | 448,589
Assets under finance lease, cost | 159,585 | 212,410
Assets under finance least, accumulated depreciation | 43,643 | 73,270
Net book value of property, plant and equipment under finance leases | 115,942 | 139,140
Total plant and equipment, cost | 936,386 | 863,914
Property, plant and equipment, accumulated depreciation | 302,682 | 276,185
Property, plant and equipment, net of accumulated depreciation $302,682 (2019 – $276,185) | 633,704 | 587,729
Heavy equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 352,948 | 299,298
Owned assets, accumulated depreciation | 102,624 | 70,031
Owned assets, net book value | 250,324 | 229,267
Assets under finance lease, cost | 97,871 | 132,270
Assets under finance least, accumulated depreciation | 25,454 | 43,466
Net book value of property, plant and equipment under finance leases | 72,417 | 88,804
Major component parts in use |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 326,022 | 252,328
Owned assets, accumulated depreciation | 111,583 | 92,161
Owned assets, net book value | 214,439 | 160,167
Assets under finance lease, cost | 52,798 | 71,706
Assets under finance least, accumulated depreciation | 16,264 | 27,918
Net book value of property, plant and equipment under finance leases | 36,534 | 43,788
Other equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 41,934 | 40,344
Owned assets, accumulated depreciation | 27,041 | 25,328
Owned assets, net book value | 14,893 | 15,016
Assets under finance lease, cost | 5,287 | 2,126
Assets under finance least, accumulated depreciation | 966 | 264
Net book value of property, plant and equipment under finance leases | 4,321 | 1,862
Licensed motor vehicles |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 16,387 | 14,270
Owned assets, accumulated depreciation | 10,592 | 9,463
Owned assets, net book value | 5,795 | 4,807
Assets under finance lease, cost | 3,629 | 5,617
Assets under finance least, accumulated depreciation | 959 | 1,551
Net book value of property, plant and equipment under finance leases | 2,670 | 4,066
Office and computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 6,337 | 5,154
Owned assets, accumulated depreciation | 4,137 | 3,511
Owned assets, net book value | 2,200 | 1,643
Assets under finance lease, cost |  | 691
Assets under finance least, accumulated depreciation |  | 71
Net book value of property, plant and equipment under finance leases |  | 620
Land |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 10,472 | 13,829
Owned assets, accumulated depreciation | 0 | 0
Owned assets, net book value | 10,472 | 13,829
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Owned assets, cost | 22,701 | 26,281
Owned assets, accumulated depreciation | 3,062 | 2,421
Owned assets, net book value | $ 19,639 | $ 23,860

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