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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Significant components of net deferred tax assets and net deferred tax liabilities | Significant components of the net deferred tax assets as reflected on the Consolidated Balance Sheets are as follows:
| December 31,
(in thousands) | 2018 | 2017
Deferred tax liabilities |  |
Prepaid assets | $ | (3,306 | ) | $ | (3,957 | )
Depreciation | (3,918 | ) | (2,021 | )
Software development costs | (4,950 | ) | (3,732 | )
Intangibles | (474 | ) | — |
Total deferred tax liabilities | (12,648 | ) | (9,710 | )
Deferred tax assets |  |
Accrued incentive compensation | 8,612 |  | 3,510 |
Net operating loss carryforward | 709 |  | 774 |
Workers’ compensation accruals | 4,739 |  | 4,586 |
Accrued rent | 918 |  | 676 |
Stock-based compensation | 6,183 |  | 4,233 |
Minority investment impairment | 676 |  | 667 |
Other | 305 |  | 216 |
Total deferred tax assets | 22,142 |  | 14,662 |
Valuation allowance | (678 | ) | (669 | )
Total net deferred tax assets | 21,464 |  | 13,993 |
Net deferred tax assets | $ | 8,816 |  | $ | 4,283 |
Components of income tax expense | The components of income tax expense are as follows:
| Year Ended December 31,
(in thousands) | 2018 | 2017 | 2016
Current income tax expense |  |  |
Federal | $ | 40,347 |  | $ | 30,009 |  | $ | 31,045 |
State | 11,133 |  | 5,988 |  | 5,190 |
Total current income tax expense | 51,480 |  | 35,997 |  | 36,235 |
Deferred income tax (benefit) expense |  |  |
Federal | (3,398 | ) | 9,549 |  | 2,641 |
State | (1,135 | ) | 193 |  | 310 |
Total deferred income tax (benefit) expense | (4,533 | ) | 9,742 |  | 2,951 |
Total income tax expense | $ | 46,947 |  | $ | 45,739 |  | $ | 39,186 |
Reconciliation of income tax expense | The reconciliation of income tax expense computed at U.S. federal statutory tax rates to the reported income tax expense from continuing operations is as follows:
| Year Ended December 31,
(in thousands) | 2018 | 2017 | 2016
Expected income tax expense at 21%, 35% and 35%, respectively | $ | 38,296 |  | $ | 45,549 |  | $ | 36,812 |
State income taxes, net of federal benefit | 7,660 |  | 4,085 |  | 3,684 |
Nondeductible expenses | 4,831 |  | 2,649 |  | 1,669 |
Section 199 benefits | — |  | (875 | ) | (686 | )
Equity compensation | (2,737 | ) | (6,218 | ) | (1,338 | )
Research and development credit | (856 | ) | (634 | ) | (751 | )
Disaster employee retention credit | — |  | (669 | ) | — |
Enactment of the 2017 Tax Reform Act | — |  | 2,559 |  | — |
Other, net | (247 | ) | (707 | ) | (204 | )
Reported total income tax expense | $ | 46,947 |  | $ | 45,739 |  | $ | 39,186 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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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