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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred tax liabilities: |  |  |
Prepaid assets | $ (3,952,000) | $ (9,291,000) |
Depreciation | (1,741,000) | (8,083,000) |
Software development costs | (2,699,000) | (2,252,000) |
Total deferred tax liabilities | (8,392,000) | (19,626,000) |
Deferred tax assets: |  |  |
Accrued incentive compensation | 8,818,000 | 7,204,000 |
Net operating loss carryforward | 1,463,000 | 1,556,000 |
Workers’ compensation accruals | 7,586,000 | 6,308,000 |
Accrued rent | 1,229,000 | 1,058,000 |
Stock-based compensation | 4,553,000 | 3,615,000 |
Intangibles | 1,159,000 | 1,575,000 |
Minority investment impairment | 1,016,000 | 1,003,000 |
Other | 564,000 | 551,000 |
Total deferred tax assets | 26,388,000 | 22,870,000 |
Valuation allowance | (1,020,000) | (1,003,000) |
Total net deferred tax assets | 25,368,000 | 21,867,000 |
Net deferred tax assets | 16,976,000 | 2,241,000 |
Current income tax expense: |  |  |
Federal | 35,221,000 | 18,034,000 | $ 20,476,000
State | 5,741,000 | 3,322,000 | 3,512,000
Total current income tax expense | 40,962,000 | 21,356,000 | 23,988,000
Deferred income tax (benefit) expense: |  |  |
Federal | (13,632,000) | (1,764,000) | (2,258,000)
State | (1,101,000) | 31,000 | (30,000)
Total deferred income tax benefit | (14,733,000) | (1,733,000) | (2,288,000)
Total income tax expense | 26,229,000 | 19,623,000 | 21,700,000
Net income tax expense (benefit) on nonqualified stock option exercises | $ 2,216,000 | 488,000 | 1,259,000
Prior Period Reclassification Adjustment |  | 6,300,000 |
Reconciliation of income tax expense [Abstract] |  |  |
Assumed income tax rate (in hundredths) | 35.00% |  |
Expected income tax expense at 35% | $ 22,967,000 | 16,670,000 | 18,806,000
State income taxes, net of federal benefit | 2,696,000 | 2,204,000 | 2,286,000
Nondeductible expenses | 1,669,000 | 1,939,000 | 1,993,000
Section 199 benefits | (627,000) | (592,000) | (2,531,000)
Expense Management non-cash impairment | 0 | 0 | 797,000
Valuation allowance related to TRE impairment | 0 | 0 | 938,000
Research and development credit | (530,000) | (455,000) | (534,000)
Other, net | 54,000 | (143,000) | (55,000)
Total income tax expense | 26,229,000 | 19,623,000 | 21,700,000
Business Acquisition [Line Items] |  |  |
Section 199 tax benefits for the tax year 2013 |  |  | (500,000)
Section 199 Tax Benefits for Tax Years 2009 to 2012 |  |  | (2,000,000)
Liability for Uncertain Tax Positions, Current | 0 | $ 0 | $ 0
ExpensAble [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Operating Loss Carryforwards | $ 3,900,000 |  |
Minimum [Member] | ExpensAble [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net operating loss carryforwards, expiration date | Jan. 01, 2022 |  |
Maximum [Member] | ExpensAble [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net operating loss carryforwards, expiration date | Jan. 01, 2030 |  |

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