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Consolidated Statements of Operations and Comprehensive Income (Loss) - CAD CAD in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |
Revenue | CAD 292,557 | CAD 213,180
Project costs | 116,346 | 80,023
Equipment costs | 91,829 | 60,020
Depreciation | 44,735 | 40,794
Gross profit | 39,647 | 32,343
General and administrative expenses | 25,299 | 27,222
Loss (gain) on disposal of property, plant and equipment | 189 | (116)
Gain on disposal of assets held for sale (note 8) | (166) | (374)
Amortization of intangible assets (note 10(b)) | 918 | 1,688
Operating income before the undernoted | 13,407 | 3,923
Interest expense (note 20) | 6,943 | 5,784
Other income | 0 | (1,375)
Foreign exchange (gain) loss | (4) | 8
Income (loss) before income taxes | 6,468 | (494)
Income tax expense (benefit) (note 11): |  |
Deferred | 1,204 | (49)
Net income (loss) | 5,264 | (445)
Comprehensive income (loss) | CAD 5,264 | CAD (445)
Per share information |  |
Net income (loss) - basic (in CAD per share) | CAD 0.20 | CAD (0.01)
Net income (loss) - diluted (in CAD per share) | CAD 0.18 | CAD (0.01)

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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