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Income Taxes | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Note 4. Income Taxes The components of the provision for income taxes are as follows:
|  | Year Ended December 31, |
(In thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 113,491 |  |  | $ | 169,053 |  |  | $ | 126,903 |
State |  |  | 38,647 |  |  |  | 25,644 |  |  |  | 20,111 |
|  |  | 152,138 |  |  |  | 194,697 |  |  |  | 147,014 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 49,125 |  |  |  | (81,551 | ) |  |  | 29,354 |
State |  |  | 8,582 |  |  |  | (1,088 | ) |  |  | 5,454 |
|  |  | 57,707 |  |  |  | (82,639 | ) |  |  | 34,808 |
Total provision for income taxes |  | $ | 209,845 |  |  | $ | 112,058 |  |  | $ | 181,822 |
The Tax Cuts and Jobs Act (the “Tax Act”) was enacted on December 22, 2017. The Tax Act reduced the U.S. federal corporate income tax rate from 35% to 21% and made several other changes to long-held tax rules. An income tax benefit of $104.9 million was recorded in our provision for income taxes in the year ended December 31, 2017 to reflect the estimated impact of the Tax Act on our net deferred tax liabilities. In 2018, we completed our accounting for the effects of the Tax Act and no material changes in our initial estimate were required. The following is a reconciliation of income tax expense calculated using the U.S. statutory federal income tax rate with our income tax expense for 2018, 2017 and 2016:
|  | Year Ended December 31, |
(In thousands) |  | 2018 |  |  | 2017 |  |  | 2016 |
Tax provision at statutory rate |  | $ | 171,258 |  |  | $ | 201,541 |  |  | $ | 167,156 |
State income taxes, net of federal benefit |  |  | 36,396 |  |  |  | 20,277 |  |  |  | 16,711 |
Revaluation of deferred taxes in connection with the Tax Act |  |  | — |  |  |  | (104,864 | ) |  |  | — |
Other, net |  |  | 2,191 |  |  |  | (4,896 | ) |  |  | (2,045 | )
Total provision for income taxes |  | $ | 209,845 |  |  | $ | 112,058 |  |  | $ | 181,822 |
Deferred tax assets and liabilities, which are included in “Other assets” and “Deferred income taxes” on our Balance Sheets, consist of the following:
|  | December 31, |
(In thousands) |  | 2018 |  |  | 2017 |
Deferred tax assets: |  |  |  |  |  |  |  |
Claims and insurance reserves |  | $ | 27,433 |  |  | $ | 29,008 |
Accrued vacation |  |  | 17,932 |  |  |  | 17,832 |
Deferred compensation |  |  | 31,306 |  |  |  | 29,220 |
Other |  |  | 20,861 |  |  |  | 15,157 |
Total deferred tax assets |  |  | 97,532 |  |  |  | 91,217 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | (339,311 | ) |  |  | (266,730 | )
Unrecognized revenue |  |  | — |  |  |  | (10,007 | )
Other |  |  | (3,151 | ) |  |  | (1,703 | )
Total deferred tax liabilities |  |  | (342,462 | ) |  |  | (278,440 | )
Net deferred tax liability |  | $ | (244,930 | ) |  | $ | (187,223 | )
We are subject to U.S. federal income tax, as well as income tax of multiple state tax jurisdictions. We remain open to examination by the Internal Revenue Service for tax years 2015 through 2018. We also remain open to examination by various state tax jurisdictions for tax years 2014 through 2018. The Company’s liability for unrecognized tax benefits was immaterial as of December 31, 2018 and 2017. Interest and penalties related to uncertain tax positions, which are immaterial, are recorded in our “Provision for income taxes” on our Statements of Operations. Changes in our liability for unrecognized tax benefits could affect our effective tax rate, if recognized, but we do not expect any material changes within the next twelve months.

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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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