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Income Taxes (Tables) | 3 Months Ended
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Mar. 31, 2020
Income Tax Disclosure [Abstract] |
Components of Provision for Income Taxes and Income before Provision for Income Taxes | The provision for income taxes differs from the amount computed by applying the U.S. federal statutory rate to income before provision for income taxes and consisted of the following (dollars in thousands):
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
|  | Amount |  |  | Rate |  |  | Amount |  |  | Rate |
Income tax expense at the federal statutory rate |  | $ | 3,987 |  |  |  | 21.0 | % |  | $ | 4,472 |  |  |  | 21.0 | %
State income tax expense, net of federal benefit |  |  | 1,018 |  |  |  | 5.4 | % |  |  | 894 |  |  |  | 4.2 | %
Windfall tax benefits, net related to stock-based compensation |  |  | (17 | ) |  |  | (0.1 | )% |  |  | (265 | ) |  |  | (1.2 | )%
Change in valuation allowance |  |  | 367 |  |  |  | 1.9 | % |  |  | 259 |  |  |  | 1.2 | %
Permanent and other items (1) |  |  | 562 |  |  |  | 3.0 | % |  |  | 297 |  |  |  | 1.4 | %
|  | $ | 5,917 |  |  |  | 31.2 | % |  | $ | 5,657 |  |  |  | 26.6 | %
(1) | Permanent items relate principally to compensation charges, qualified transportation fringe benefits, reversal of uncertain tax positions, meals and entertainment and our tax-exempt deferred compensation plan assets.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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