Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Net deferred tax assets	$ 4,892,000	$ 9,603,000
Valuation allowance	(681,000)	(676,000)
Total net deferred tax assets	52,575,000	49,449,000
Deferred Tax Assets, Gross [Abstract]
Accrued incentive compensation	11,117,000	5,092,000
Net operating loss carryforward	487,000	558,000
Workers’ compensation accruals	6,592,000	6,310,000
Accrued rent	1,858,000	1,553,000
Stock-based compensation	8,886,000	11,383,000
DeferredTaxAssetsOperatingLeaseLiablities	21,722,000	21,024,000
Minority investment impairment	681,000	676,000
CARESActDTA	1,626,000	3,235,000
Other	287,000	294,000
Total deferred tax assets	53,256,000	50,125,000
Deferred tax liabilities
Prepaid assets	(4,665,000)	(4,207,000)
Depreciation	(8,210,000)	(4,941,000)
Software development costs	(11,140,000)	(8,230,000)
Deferred Tax Liabilities, Other	(3,517,000)	(3,702,000)
Deferred Tax Liabilities, Leasing Arrangements	(18,205,000)	(17,322,000)
Deferred Tax Liabilities, Goodwill and Intangible Assets	(1,946,000)	(1,444,000)
Total deferred tax liabilities	(47,683,000)	(39,846,000)
Current income tax expense
Federal	30,887,000	45,558,000	$ 27,385,000
State	8,640,000	11,122,000	6,299,000
Total current income tax expense	39,527,000	56,680,000	33,684,000
Deferred income tax (benefit) expense
Federal	4,562,000	(4,678,000)	4,016,000
State	149,000	(969,000)	844,000
Total deferred income tax (benefit) expense	4,711,000	(5,647,000)	4,860,000
Total income tax expense	44,238,000	51,033,000	38,544,000
Reconciliation of income tax expense [Abstract]
Expected income tax expense at 21%	35,347,000	39,747,000	39,825,000
State income taxes, net of federal benefit	6,974,000	7,818,000	5,821,000
Nondeductible expenses	7,362,000	3,641,000	5,959,000
Equity compensation, net	(4,427,000)	1,335,000	(12,120,000)
Research and development credit	(1,018,000)	(1,479,000)	(1,069,000)
Other, net	0	(29,000)	128,000
Total income tax expense	44,238,000	51,033,000	38,544,000
Liability for Uncertain Tax Positions, Current	$ 0	$ 0	$ 0
Assumed income tax rate (in hundredths)	21.00%
ExpensAble [Member]
Operating Loss Carryforwards	$ 1,900,000