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v3.20.4

Property, plant and equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment
December 31, 2020 |  | Cost |  | Accumulated Depreciation |  | Net Book Value
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 352,948 |  |  | $ | 102,624 |  |  | $ | 250,324 |
Major component parts in use |  | 326,022 |  |  | 111,583 |  |  | 214,439 |
Other equipment |  | 41,934 |  |  | 27,041 |  |  | 14,893 |
Licensed motor vehicles |  | 16,387 |  |  | 10,592 |  |  | 5,795 |
Office and computer equipment |  | 6,337 |  |  | 4,137 |  |  | 2,200 |
Land |  | 10,472 |  |  | — |  |  | 10,472 |
Buildings |  | 22,701 |  |  | 3,062 |  |  | 19,639 |
|  | 776,801 |  |  | 259,039 |  |  | 517,762 |
Assets under finance lease |  |  |  |  |  |
Heavy equipment |  | 97,871 |  |  | 25,454 |  |  | 72,417 |
Major component parts in use |  | 52,798 |  |  | 16,264 |  |  | 36,534 |
Other equipment |  | 5,287 |  |  | 966 |  |  | 4,321 |
Licensed motor vehicles |  | 3,629 |  |  | 959 |  |  | 2,670 |
|  | 159,585 |  |  | 43,643 |  |  | 115,942 |
Total property, plant and equipment |  | $ | 936,386 |  |  | $ | 302,682 |  |  | $ | 633,704 |
December 31, 2019 |  | Cost |  | Accumulated Depreciation |  | Net Book Value
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 299,298 |  |  | $ | 70,031 |  |  | $ | 229,267 |
Major component parts in use |  | 252,328 |  |  | 92,161 |  |  | 160,167 |
Other equipment |  | 40,344 |  |  | 25,328 |  |  | 15,016 |
Licensed motor vehicles |  | 14,270 |  |  | 9,463 |  |  | 4,807 |
Office and computer equipment |  | 5,154 |  |  | 3,511 |  |  | 1,643 |
Land |  | 13,829 |  |  | — |  |  | 13,829 |
Buildings |  | 26,281 |  |  | 2,421 |  |  | 23,860 |
|  | 651,504 |  |  | 202,915 |  |  | 448,589 |
Assets under finance lease |  |  |  |  |  |
Heavy equipment |  | 132,270 |  |  | 43,466 |  |  | 88,804 |
Major component parts in use |  | 71,706 |  |  | 27,918 |  |  | 43,788 |
Other equipment |  | 2,126 |  |  | 264 |  |  | 1,862 |
Licensed motor vehicles |  | 5,617 |  |  | 1,551 |  |  | 4,066 |
Office and computer equipment |  | 691 |  |  | 71 |  |  | 620 |
|  | 212,410 |  |  | 73,270 |  |  | 139,140 |
Total property, plant and equipment |  | $ | 863,914 |  |  | $ | 276,185 |  |  | $ | 587,729 |

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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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