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Income Tax Expense | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Income Tax Expense | Income Tax Expense The components of the provision for income tax expense are as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| $ |  | $ |  | $ |  | $
Current | (8,410 | ) |  | (4,283 | ) |  | (11,221 | ) |  | (5,945 | )
Deferred | (336 | ) |  | 756 |  |  | (1,642 | ) |  | (601 | )
Income tax expense | (8,746 | ) |  | (3,527 | ) |  | (12,863 | ) |  | (6,546 | )
The following reflects the changes in the Company’s potential tax on freight income, recorded in other long-term liabilities, from January 1, 2018 to June 30, 2018:
| $
Balance of unrecognized tax benefits as at January 1, 2018 | 31,061 |
Increase for positions related to the current period | 2,047 |
Changes for positions taken in prior periods | 2,337 |
Decrease related to statute of limitations | (312 | )
Balance of unrecognized tax benefits as at June 30, 2018 | 35,133 |
The majority of the net increase for positions for the six months ended June 30, 2018 relates to potential tax on freight income. The Company does not presently anticipate such unrecognized tax benefits will significantly increase or decrease in the next 12 months; however, actual developments could differ from those currently expected.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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