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Income Taxes | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes The provision for income taxes for the years ended December 31, 2018, 2017 and 2016, consists of the following (in thousands):
| 2018 |  | 2017 |  | 2016
Current provision: |  |  |  |  |
Federal | $ | (164) |  | $ | 3,074 |  | $ | 4,280
State | (84) |  | 260 |  | 429
Total current (benefit) provision | (248) |  | 3,334 |  | 4,709
Deferred provision: |  |  |  |  |
Federal expense (benefit) | 573 |  | (21,582) |  | (2,713)
Total deferred expense (benefit) | 573 |  | (21,582) |  | (2,713)
Total expense (benefit) provision | $ | 325 |  | $ | (18,248) |  | $ | 1,996
On December 22, 2017, the U.S. government enacted the 2017 Tax Act. The 2017 Tax Act made broad and complex changes to the U.S. tax code that affected the Company’s 2017 financial results. The 2017 Tax Act also established new tax laws that will affect the Company’s financial results after 2017, including a reduction in the U.S. federal corporate income tax rate from 35 percent to 21 percent; additional limitations on the deductibility of executive compensation; limitations on the deductibility of interest; and repeal of the domestic manufacturing deduction. As such, the Company recognized a $18.4 million income tax benefit related to the re-measurement of our deferred tax assets and liabilities in our 2017 financial statements in accordance with SAB 118, which provides SEC staff guidance for the application of ASC 740 in the reporting period in which the 2017 Tax Act was signed into law. We completed our detailed analysis in 2018 with no material adjustments. The income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) as of December 31, 2018 and 2017, are as follows (in thousands):
| 2018 |  | 2017 |
Deferred income tax assets: |  |  |  |
Net operating loss carryover | $ | 2,415 |  | $ | — |
Stock Compensation | 746 |  | 843 |
Other | 441 |  | 201 |
Total deferred income tax assets | $ | 3,602 |  | $ | 1,044 |
Deferred income tax liabilities: |  |  |  |
Property and equipment | $ | (34,968) |  | (32,377) |
Goodwill and other intangible assets | (573) |  | (604) |
Other | (219) |  | (226) |
Total deferred income tax liabilities | (35,760) |  | (33,207) |
Net deferred income tax liabilities | $ | (32,158) |  | $ | (32,163) |
The effective tax rate for the years ended December 31, 2018, 2017 and 2016, differs from the statutory rate as follows:
| 2018 |  | 2017 |  | 2016
Statutory rate | 21.0 | % |  | 34.0 | % |  | 34.0 | %
State and local taxes | 1.5 | % |  | 1.5 | % |  | 1.6 | %
Uncertain tax position | 72.9 | % |  | — | % |  | — | %
Research and development credit | (48.3) | % |  | — | % |  | (7.5) | %
Stock based compensation | (5.2) | % |  | (13.4) | % |  | 0.3 | %
Nondeductible compensation | 4.1 | % |  | — | % |  | — | %
Domestic production credit | — | % |  | (14.3) | % |  | (5.4) | %
Other | (2.7) | % |  | (1.5) | % |  | 0.6 | %
Effective rate | 43.3 | % |  | 6.3 | % |  | 23.6 | %
Deferred re-measurement for rate change | — | % |  | (1,144.4) | % |  | — | %
Effective rate | 43.3 | % |  | (1,138.1) | % |  | 23.6 | %
During the fourth quarter of 2018, the Company discovered a potential uncertain tax position attributable to the deductibility of certain executive compensation expense for federal income tax purposes aggregating approximately $168,000, $149,000 and $230,000 for the years ended December 31, 2017, 2016 and 2015, respectively. As a result, in accordance with ASC Topic 740, during the fourth quarter of 2018, the Company recorded a tax adjustment of $547,000 and accrued penalty and interest expense of $55,000 attributable to the uncertain tax position. Management of the Company determined that effect of the potential uncertain tax position on previously reported results of operations for the years ended December 31, 2017 and 2016 was not material. We account for uncertain tax positions in accordance with guidance in FASB ASC 740, which prescribes the minimum recognition threshold a tax position taken or expected to be taken in a tax return is required to meet before being recognized in the financial statements. A reconciliation of the beginning and ending amount of uncertain tax positions is as follows (in thousands):
Balance at January 1, 2018 | $ | —
Additions based on tax positions related to current year | 31
Additions to tax positions of prior years | 547
Balance at December 31, 2018 | $ | 578
Our policy regarding income tax interest and penalties is to expense those items as incurred. During the years ended December 31, 2018, 2017 and 2016, there were no significant income tax interest or penalty items in the statement of income. We had a regular income tax net operating loss carry forward of $10.7 million for federal income taxes as of December 31, 2018. This net operating loss will be carried forward indefinitely but subject to 80% limitation. We file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. With few exceptions, we are no longer subject to U.S. federal or state income tax examination by tax authorities for years before 2014.

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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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