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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2020
Property, plant and equipment |
Property, Plant and Equipment | 16. Property, plant and equipment ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Accumulated |  | ​ | ​
As at December 31, 2019 | ​ | Cost | ​ | depreciation | ​ | Net book value
Land and improvements | ​ | $ | 361,623 | ​ | $ | (77,015) | ​ | $ | 284,608
Buildings | ​ |  | 252,774 | ​ |  | (115,423) | ​ |  | 137,351
Yard and automotive equipment | ​ |  | 66,871 | ​ |  | (40,686) | ​ |  | 26,185
Computer software and equipment | ​ |  | 80,756 | ​ |  | (68,431) | ​ |  | 12,325
Office equipment | ​ |  | 31,760 | ​ |  | (21,776) | ​ |  | 9,984
Leasehold improvements | ​ |  | 19,756 | ​ |  | (16,541) | ​ |  | 3,215
Assets under development | ​ |  | 10,814 | ​ |  | — | ​ |  | 10,814
​ | ​ | $ | 824,354 | ​ | $ | (339,872) | ​ | $ | 484,482
​ During the year ended December 31, 2020, interest of $150,000 (2019: $85,000; 2018: $110,000) was capitalized to the cost of assets under development. These interest costs relating to qualifying assets are capitalized at a weighted average rate of 3.02% (2019: 4.07%; 2018: 4.06%). Additions during the year include $11,392,000 (2019: $15,282,000; 2018: $8,968,000) 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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