Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Net deferred tax assets	$ 15,533,000	$ 4,892,000
Valuation allowance	(675,000)	(681,000)
Total net deferred tax assets	52,731,000	52,575,000
Deferred Tax Assets, Gross [Abstract]
Accrued incentive compensation	13,116,000	11,117,000
Net operating loss carryforward	407,000	487,000
Workers’ compensation accruals	5,358,000	6,592,000
Accrued rent	1,790,000	1,858,000
Stock-based compensation	12,255,000	8,886,000
DeferredTaxAssetsOperatingLeaseLiablities	19,508,000	21,722,000
Minority investment impairment	675,000	681,000
CARESActDTA	0	1,626,000
Other	297,000	287,000
Total deferred tax assets	53,406,000	53,256,000
Deferred tax liabilities
Prepaid assets	(5,395,000)	(4,665,000)
Depreciation	(7,448,000)	(8,210,000)
Software development costs	(2,598,000)	(11,140,000)
Deferred Tax Liabilities, Other	(3,139,000)	(3,517,000)
Deferred Tax Liabilities, Leasing Arrangements	(16,371,000)	(18,205,000)
Deferred Tax Liabilities, Goodwill and Intangible Assets	(2,247,000)	(1,946,000)
Total deferred tax liabilities	(37,198,000)	(47,683,000)
Current income tax expense
Federal	61,649,000	30,887,000	$ 45,558,000
State	15,067,000	8,640,000	11,122,000
Total current income tax expense	76,716,000	39,527,000	56,680,000
Deferred income tax (benefit) expense
Federal	(8,844,000)	4,562,000	(4,678,000)
State	(1,797,000)	149,000	(969,000)
Total deferred income tax (benefit) expense	(10,641,000)	4,711,000	(5,647,000)
Total income tax expense	66,075,000	44,238,000	51,033,000
Reconciliation of income tax expense [Abstract]
Expected income tax expense at 21%	51,539,000	35,347,000	39,747,000
State income taxes, net of federal benefit	10,106,000	6,974,000	7,818,000
Nondeductible expenses	4,338,000	7,362,000	3,641,000
Equity compensation, net	1,345,000	(4,427,000)	1,335,000
Research and development credit	(1,241,000)	(1,018,000)	(1,479,000)
Other, net	(12,000)	0	(29,000)
Total income tax expense	66,075,000	44,238,000	51,033,000
Liability for Uncertain Tax Positions, Current	$ 0	$ 0	$ 0
Assumed income tax rate (in hundredths)	21.00%
ExpensAble [Member]
Operating Loss Carryforwards	$ 1,600,000