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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2021
Property, plant and equipment |
Property, plant and Equipment | 16. Property, plant and equipment ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
As at December 31, 2021 | ​ | Cost | ​ | depreciation | ​ | Net book value
Land and improvements | ​ | $ | 347,980 | ​ | $ | (83,709) | ​ | $ | 264,271
Buildings | ​ |  | 250,692 | ​ |  | (129,237) | ​ |  | 121,455
Yard and automotive equipment | ​ |  | 79,536 | ​ |  | (53,945) | ​ |  | 25,591
Computer software and equipment | ​ |  | 84,371 | ​ |  | (73,330) | ​ |  | 11,041
Office equipment | ​ |  | 37,187 | ​ |  | (26,957) | ​ |  | 10,230
Leasehold improvements | ​ |  | 23,471 | ​ |  | (15,995) | ​ |  | 7,476
Assets under development | ​ |  | 9,023 | ​ |  | — | ​ |  | 9,023
​ | ​ | $ | 832,260 | ​ | $ | (383,173) | ​ | $ | 449,087
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
As at December 31, 2020 | ​ | Cost | ​ | depreciation | ​ | Net book value
Land and improvements | ​ | $ | 370,511 | ​ | $ | (81,591) | ​ | $ | 288,920
Buildings | ​ |  | 259,928 | ​ |  | (125,944) | ​ |  | 133,984
Yard and automotive equipment | ​ |  | 74,151 | ​ |  | (47,663) | ​ |  | 26,488
Computer software and equipment | ​ |  | 86,423 | ​ |  | (72,169) | ​ |  | 14,254
Office equipment | ​ |  | 35,587 | ​ |  | (24,729) | ​ |  | 10,858
Leasehold improvements | ​ |  | 21,654 | ​ |  | (15,510) | ​ |  | 6,144
Assets under development | ​ |  | 11,479 | ​ |  | — | ​ |  | 11,479
​ | ​ | $ | 859,733 | ​ | $ | (367,606) | ​ | $ | 492,127
​ During the year ended December 31, 2021, interest of $138,000 (2020: $150,000; 2019: $85,000) was capitalized to the cost of assets under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 2.54% (2020: 3.02%; 2019: 4.07%). Additions during the year include $7,452,000 (2020: $11,392,000; 2019: $15,282,000) of property, plant and equipment under finance leases.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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