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Income taxes | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income taxes | Income taxes Income tax provision differs from the amount that would be computed by applying the Federal and Provincial statutory income tax rates to income before income taxes. The reasons for the differences are as follows:
Year ended December 31, |  | 2018 |  |  | 2017 |
Income before income taxes |  | $ | 21,417 |  |  | $ | 6,468 |
Tax rate |  | 27.00 | % |  | 27.00 | %
Expected expense |  | $ | 5,783 |  |  | $ | 1,746 |
(Decrease) increase related to: |  |  |  |
Income tax adjustments and reassessments |  | — |  |  | 30 |
Non taxable portion of capital gains |  | (60 | ) |  | (672 | )
Stock-based compensation |  | 26 |  |  | 88 |
Other |  | 347 |  |  | 12 |
Deferred income tax expense |  | $ | 6,096 |  |  | $ | 1,204 |
The deferred tax assets and liabilities are summarized below:
|  | December 31, 2018 |  |  | December 31, 2017 |
Deferred tax assets: |  |  |  |
Non-capital and net capital loss carryforwards |  | $ | 24,478 |  |  | $ | 18,619 |
Deferred financing costs |  | — |  |  | 52 |
Contract liabilities |  | 572 |  |  | 222 |
Capital lease obligations |  | 23,207 |  |  | 17,961 |
Stock-based compensation |  | 3,545 |  |  | 2,985 |
Other |  | 2,538 |  |  | 2,357 |
Subtotal |  | $ | 54,340 |  |  | $ | 42,196 |
Less: valuation allowance |  | (1,035 | ) |  | (1,035 | )
|  | $ | 53,305 |  |  | $ | 41,161 |
Deferred tax liabilities: |  |  |  |
Contract assets |  | $ | 3,711 |  |  | $ | 5,231 |
Assets held for sale |  | 116 |  |  | 1,523 |
Accounts receivable – holdbacks |  | 96 |  |  | 72 |
Property, plant and equipment |  | 84,811 |  |  | 61,953 |
Deferred financing costs |  | 86 |  |  | — |
|  | $ | 88,820 |  |  | $ | 68,779 |
Net deferred income tax liability |  | $ | 35,515 |  |  | $ | 27,618 |
Classified as:
|  | December 31, 2018 |  |  | December 31, 2017 |
Deferred tax asset |  | $ | 9,272 |  |  | $ | 10,539 |
Deferred tax liability |  | (44,787 | ) |  | (38,157 | )
|  | $ | (35,515 | ) |  | $ | (27,618 | )
In 2018 and 2017, the Company and its subsidiaries file income tax returns in the Canadian federal jurisdiction and one provincial jurisdiction. At December 31, 2018, the Company has a deferred tax asset of $23,443 resulting from non-capital loss carryforwards of $86,826, which expire as follows:
|  | December 31, 2018 |
2025 |  | $ | 2 |
2026 |  | 151 |
2027 |  | 128 |
2031 |  | 605 |
2032 |  | 6,409 |
2033 |  | 5,893 |
2034 |  | 5,200 |
2036 |  | 2,207 |
2037 |  | 17,922 |
2038 |  | 48,309 |
|  | $ | 86,826 |
At December 31, 2018, the Company has recorded a full valuation allowance against the deferred tax asset of $1,035 resulting from net capital loss carryforwards of $7,664, which have an indefinite life.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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