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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, plant and equipment | Property, plant and equipment
December 31, 2018 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 346,071 |  |  | $ | 78,296 |  |  | $ | 267,775 |
Major component parts in use |  | 143,032 |  |  | 66,019 |  |  | 77,013 |
Other equipment |  | 33,824 |  |  | 21,711 |  |  | 12,113 |
Licensed motor vehicles |  | 19,745 |  |  | 15,618 |  |  | 4,127 |
Office and computer equipment |  | 8,972 |  |  | 6,450 |  |  | 2,522 |
Land |  | 11,095 |  |  | — |  |  | 11,095 |
Buildings |  | 31,425 |  |  | 6,265 |  |  | 25,160 |
Leasehold improvements |  | 2,875 |  |  | 1,053 |  |  | 1,822 |
|  | 597,039 |  |  | 195,412 |  |  | 401,627 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 110,759 |  |  | 35,376 |  |  | 75,383 |
Major component parts in use |  | 64,602 |  |  | 16,964 |  |  | 47,638 |
Other equipment |  | 772 |  |  | 17 |  |  | 755 |
Licensed motor vehicles |  | 3,822 |  |  | 1,087 |  |  | 2,735 |
Office and computer equipment |  | 23 |  |  | 23 |  |  | — |
Buildings |  | 25 |  |  | 6 |  |  | 19 |
|  | 180,003 |  |  | 53,473 |  |  | 126,530 |
Total property, plant and equipment |  | $ | 777,042 |  |  | $ | 248,885 |  |  | $ | 528,157 |
December 31, 2017 |  | Cost |  |  | Accumulated Depreciation |  |  | Net Book Value |
Owned assets |  |  |  |  |  |
Heavy equipment |  | $ | 196,045 |  |  | $ | 77,726 |  |  | $ | 118,319 |
Major component parts in use |  | 72,448 |  |  | 45,694 |  |  | 26,754 |
Other equipment |  | 31,923 |  |  | 18,400 |  |  | 13,523 |
Licensed motor vehicles |  | 18,298 |  |  | 14,888 |  |  | 3,410 |
Office and computer equipment |  | 10,157 |  |  | 9,468 |  |  | 689 |
Land |  | 7,168 |  |  | — |  |  | 7,168 |
Buildings |  | 2,547 |  |  | 2,482 |  |  | 65 |
|  | 338,586 |  |  | 168,658 |  |  | 169,928 |
Assets under capital lease |  |  |  |  |  |
Heavy equipment |  | 69,657 |  |  | 28,613 |  |  | 41,044 |
Major component parts in use |  | 85,015 |  |  | 21,247 |  |  | 63,768 |
Other equipment |  | 558 |  |  | 543 |  |  | 15 |
Licensed motor vehicles |  | 5,129 |  |  | 1,242 |  |  | 3,887 |
Office and computer equipment |  | 23 |  |  | 17 |  |  | 6 |
|  | 160,382 |  |  | 51,662 |  |  | 108,720 |
Total property, plant and equipment |  | $ | 498,968 |  |  | $ | 220,320 |  |  | $ | 278,648 |
During the year ended December 31, 2018, additions to property, plant and equipment by means of capital leases were $21,904 (2017 - $14,033). During the year ended December 31, 2018, the Company completed sale-leaseback transactions of $29,295 (2017 - $20,697). Deferred gains on sale-leaseback transactions are included in other long term obligations and are amortized over the expected life of the equipment (note 17(d)). Depreciation of equipment under capital lease of $25,995 (2017 – $19,483) was included in depreciation expense in the current year.

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- References No definition available. + Details
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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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