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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax liabilities:      
Prepaid assets $ (7,133,000) $ (3,952,000)  
Depreciation (936,000) (1,741,000)  
Software development costs (3,960,000) (2,699,000)  
Total deferred tax liabilities (12,029,000) (8,392,000)  
Deferred tax assets:      
Accrued incentive compensation 8,590,000 8,818,000  
Net operating loss carryforward 1,300,000 1,463,000  
Workers’ compensation accruals 7,891,000 7,586,000  
Accrued rent 1,092,000 1,229,000  
Stock-based compensation 6,217,000 4,553,000  
Intangibles 618,000 1,159,000  
Minority investment impairment 1,021,000 1,016,000  
Other 349,000 564,000  
Total deferred tax assets 27,078,000 26,388,000  
Valuation allowance (1,024,000) (1,020,000)  
Total net deferred tax assets 26,054,000 25,368,000  
Net deferred tax assets 14,025,000 16,976,000  
Current income tax expense:      
Federal 31,045,000 35,221,000 $ 18,034,000
State 5,190,000 5,741,000 3,322,000
Total current income tax expense 36,235,000 40,962,000 21,356,000
Deferred income tax (benefit) expense:      
Federal 2,641,000 (13,632,000) (1,764,000)
State 310,000 (1,101,000) 31,000
Total deferred income tax (benefit) expense 2,951,000 (14,733,000) (1,733,000)
Total income tax expense 39,186,000 26,229,000 19,623,000
Income tax benefit recognized related to Equity Compensation after adoption of ASU 2016-09, Quantification $ 1,500,000    
Income tax benefit recognized related to Equity Compensation after adoption of ASU 2016-09, per share $ 0.07    
Net income tax expense (benefit) on nonqualified stock option exercises   2,216,000 488,000
Reconciliation of income tax expense [Abstract]      
Assumed income tax rate (in hundredths) 35.00%    
Expected income tax expense at 35% $ 36,812,000 22,967,000 16,670,000
State income taxes, net of federal benefit 3,684,000 2,696,000 2,204,000
Nondeductible expenses 1,669,000 1,669,000 1,939,000
Section 199 benefits (686,000) (627,000) (592,000)
Equity compensation (1,338,000) 0 0
Research and development credit (751,000) (530,000) (455,000)
Other, net (204,000) 54,000 (143,000)
Total income tax expense 39,186,000 26,229,000 19,623,000
Business Acquisition [Line Items]      
Liability for Uncertain Tax Positions, Current 0 $ 0 $ 0
ExpensAble [Member]      
Business Acquisition [Line Items]      
Operating Loss Carryforwards $ 3,400,000    
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