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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred tax liabilities:      
Prepaid assets $ (5,084,000) $ (6,929,000)  
Depreciation (8,937,000) (8,580,000)  
Software development costs (2,739,000) (3,104,000)  
Total deferred tax liabilities (16,760,000) (18,613,000)  
Deferred tax assets:      
Accrued incentive compensation 3,909,000 4,896,000  
Net operating loss carryforward 1,773,000 2,057,000  
Workers’ compensation accruals 5,568,000 5,079,000  
Accrued rent 1,008,000 1,033,000  
Stock-based compensation 3,742,000 3,114,000  
Intangibles 837,000 227,000  
Minority investment impairment 991,000 0  
Other 412,000 418,000  
Total deferred tax assets 18,240,000 16,824,000  
Valuation allowance (991,000) 0  
Total net deferred tax assets 17,249,000 16,824,000  
Net deferred tax assets (liabilities) 489,000 (1,789,000)  
Net current deferred tax assets 8,185,000 7,211,000  
Net noncurrent deferred tax liabilities (7,696,000) (9,000,000)  
Current income tax expense:      
Federal 20,476,000 29,280,000 16,816,000
State 3,512,000 4,351,000 3,535,000
Total current income tax expense 23,988,000 33,631,000 20,351,000
Deferred income tax (benefit) expense:      
Federal (2,258,000) (5,363,000) 47,000
State (30,000) (380,000) (93,000)
Total deferred income tax benefit (2,288,000) (5,743,000) (46,000)
Total income tax expense 21,700,000 27,888,000 20,305,000
Net income tax expense (benefit) on nonqualified stock option exercises 1,259,000 1,751,000 1,663,000
Reconciliation of income tax expense [Abstract]      
Assumed income tax rate (in hundredths) 35.00%    
Expected income tax expense at 35% 18,806,000 23,901,000 17,770,000
State income taxes, net of federal benefit 2,286,000 2,497,000 2,249,000
Nondeductible expenses 1,993,000 1,663,000 904,000
Section 199 benefits (2,531,000) 0 0
Expense Management non-cash impairment 797,000 0 0
Valuation allowance related to TRE impairment 938,000 0 0
Research and development credit (534,000) 0 (558,000)
Other, net (55,000) (173,000) (60,000)
Total income tax expense 21,700,000 27,888,000 20,305,000
Business Acquisition [Line Items]      
Section 199 tax benefits for the tax year 2013 (530,000)    
Section 199 Tax Benefits for Tax Years 2009 to 2012 (2,000,000)    
Provision for interest or penalties related to uncertain tax positions 0 0 0
ExpensAble [Member]
      
Business Acquisition [Line Items]      
Operating Loss Carryforwards $ 4,800,000    
Minimum [Member] | ExpensAble [Member]
      
Business Acquisition [Line Items]      
Net operating loss carryforwards, expiration date 2022    
Maximum [Member] | ExpensAble [Member]
      
Business Acquisition [Line Items]      
Net operating loss carryforwards, expiration date 2030