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Plant and equipment | 12 Months Ended
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Dec. 31, 2014
Property, Plant and Equipment [Abstract] |
Plant and equipment | Plant and equipment
December 31, 2014 |  | Cost |  |  | Accumulated Deprecation |  |  | Net Book Value |
Heavy equipment |  | $ | 142,052 |  |  | $ | 42,292 |  |  | $ | 99,760 |
Major component parts in use |  | 112,645 |  |  | 55,895 |  |  | 56,750 |
Other equipment |  | 41,739 |  |  | 18,758 |  |  | 22,981 |
Licensed motor vehicles |  | 24,247 |  |  | 20,763 |  |  | 3,484 |
Office and computer equipment |  | 9,355 |  |  | 8,216 |  |  | 1,139 |
Buildings |  | 2,791 |  |  | 2,606 |  |  | 185 |
Assets under capital lease |  | 101,606 |  |  | 25,007 |  |  | 76,599 |
|  | $ | 434,435 |  |  | $ | 173,537 |  |  | $ | 260,898 |
December 31, 2013 |  | Cost |  |  | Accumulated Deprecation |  |  | Net Book Value |
Heavy equipment |  | $ | 251,872 |  |  | $ | 96,038 |  |  | $ | 155,834 |
Major component parts in use |  | 60,484 |  |  | 23,472 |  |  | 37,012 |
Other equipment |  | 27,594 |  |  | 11,511 |  |  | 16,083 |
Licensed motor vehicles |  | 25,911 |  |  | 22,474 |  |  | 3,437 |
Office and computer equipment |  | 13,846 |  |  | 11,882 |  |  | 1,964 |
Buildings |  | 4,691 |  |  | 2,650 |  |  | 2,041 |
Leasehold improvements |  | 9,946 |  |  | 6,187 |  |  | 3,759 |
Assets under capital lease |  | 72,627 |  |  | 14,782 |  |  | 57,845 |
|  | $ | 466,971 |  |  | $ | 188,996 |  |  | $ | 277,975 |
Assets under capital lease are comprised predominately of heavy equipment and licensed motor vehicles. During the year ended December 31, 2014, additions to plant and equipment included $39,492 of assets that were acquired by means of capital leases (2013 – $13,812). Depreciation of equipment under capital lease of $12,108 (2013 – $6,694) was included in depreciation expense in the current year.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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