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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred tax liabilities |  |  |
Prepaid assets | $ (4,252,000) | $ (3,306,000) |
Depreciation | (4,564,000) | (3,918,000) |
Software development costs | (6,475,000) | (4,950,000) |
Deferred Tax Liabilities, Other | (3,209,000) | 0 |
Deferred Tax Liabilities, Leasing Arrangements | (15,949,000) | 0 |
Deferred Tax Liabilities, Goodwill and Intangible Assets | (955,000) | (474,000) |
Total deferred tax liabilities | (35,404,000) | (12,648,000) |
Deferred tax assets |  |  |
Accrued incentive compensation | 5,946,000 | 8,612,000 |
Net operating loss carryforward | 632,000 | 709,000 |
Workers’ compensation accruals | 5,404,000 | 4,739,000 |
Accrued rent | 1,223,000 | 918,000 |
Stock-based compensation | 6,712,000 | 6,183,000 |
DeferredTaxAssetsOperatingLeaseLiablities | 19,158,000 | 0 |
Minority investment impairment | 673,000 | 676,000 |
Other | 287,000 | 305,000 |
Total deferred tax assets | 40,035,000 | 22,142,000 |
Valuation allowance | (675,000) | (678,000) |
Total net deferred tax assets | 39,360,000 | 21,464,000 |
Net deferred tax assets | 3,956,000 | 8,816,000 |
Current income tax expense |  |  |
Federal | 27,385,000 | 40,347,000 | $ 30,009,000
State | 6,299,000 | 11,133,000 | 5,988,000
Total current income tax expense | 33,684,000 | 51,480,000 | 35,997,000
Deferred income tax (benefit) expense |  |  |
Federal | 4,016,000 | (3,398,000) | 9,549,000
State | 844,000 | (1,135,000) | 193,000
Total deferred income tax (benefit) expense | 4,860,000 | (4,533,000) | 9,742,000
Total income tax expense | 38,544,000 | 46,947,000 | 45,739,000
Income tax benefit recognized related to Equity Compensation after adoption of ASU 2016-09, Quantification | $ 14,600,000 | $ 3,900,000 | $ 6,800,000
Reconciliation of income tax expense [Abstract] |  |  |
Assumed income tax rate (in hundredths) | 21.00% | 35.00% | 35.00%
Expected income tax expense at 21%, 21% and 35%, respectively | $ 39,825,000 | $ 38,296,000 | $ 45,549,000
State income taxes, net of federal benefit | 5,821,000 | 7,660,000 | 4,085,000
Nondeductible expenses | 5,959,000 | 4,831,000 | 2,649,000
Section 199 benefits | 0 | 0 | (875,000)
Equity compensation | (12,120,000) | (2,737,000) | (6,218,000)
Research and development credit | (1,069,000) | (856,000) | (634,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount | 0 | 0 | (669,000)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 0 | 0 | 2,559,000
Other, net | 128,000 | (247,000) | (707,000)
Total income tax expense | 38,544,000 | 46,947,000 | 45,739,000
Liability for Uncertain Tax Positions, Current | 0 | $ 0 | $ 0
ExpensAble [Member] |  |  |
Operating Loss Carryforwards | $ 2,500,000 |  |

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