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Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets      
Net deferred tax assets $ 9,603,000 $ 3,956,000  
Valuation allowance (676,000) (675,000)  
Total net deferred tax assets 49,449,000 39,360,000  
Deferred Tax Assets, Gross [Abstract]      
Accrued incentive compensation 5,092,000 5,946,000  
Net operating loss carryforward 558,000 632,000  
Workers’ compensation accruals 6,310,000 5,404,000  
Accrued rent 1,553,000 1,223,000  
Stock-based compensation 11,383,000 6,712,000  
DeferredTaxAssetsOperatingLeaseLiablities 21,024,000 19,158,000  
Minority investment impairment 676,000 673,000  
CARESActDTA 3,235,000 0  
Other 294,000 287,000  
Total deferred tax assets 50,125,000 40,035,000  
Deferred tax liabilities      
Prepaid assets (4,207,000) (4,252,000)  
Depreciation (4,941,000) (4,564,000)  
Software development costs (8,230,000) (6,475,000)  
Deferred Tax Liabilities, Other (3,702,000) (3,209,000)  
Deferred Tax Liabilities, Leasing Arrangements (17,322,000) (15,949,000)  
Deferred Tax Liabilities, Goodwill and Intangible Assets (1,444,000) (955,000)  
Total deferred tax liabilities (39,846,000) (35,404,000)  
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount 2,100,000 14,600,000 $ 3,900,000
Current income tax expense      
Federal 45,558,000 27,385,000 40,347,000
State 11,122,000 6,299,000 11,133,000
Total current income tax expense 56,680,000 33,684,000 51,480,000
Deferred income tax (benefit) expense      
Federal (4,678,000) 4,016,000 (3,398,000)
State (969,000) 844,000 (1,135,000)
Total deferred income tax (benefit) expense (5,647,000) 4,860,000 (4,533,000)
Total income tax expense 51,033,000 38,544,000 46,947,000
Reconciliation of income tax expense [Abstract]      
Expected income tax expense at 21% 39,747,000 39,825,000 38,296,000
State income taxes, net of federal benefit 7,818,000 5,821,000 7,660,000
Nondeductible expenses 3,641,000 5,959,000 4,831,000
Equity compensation, net 1,335,000 (12,120,000) (2,737,000)
Research and development credit (1,479,000) (1,069,000) (856,000)
Other, net (29,000) 128,000 (247,000)
Total income tax expense 51,033,000 $ 38,544,000 $ 46,947,000
Liability for Uncertain Tax Positions, Current $ 0    
Assumed income tax rate (in hundredths) 21.00%    
ExpensAble [Member]      
Operating Loss Carryforwards $ 2,200,000