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Income Taxes - Differences Between Federal Tax Rate and Company's Effective Tax Rate for Results of Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
U.S. tax at statutory rate	$ 10,125	$ 11,274	$ 9,710
State income taxes, net of federal benefit	1,956	2,059	1,722
Excess equity compensation deduction	(99)	(871)	(806)
Non-deductible expenses	1,040	1,185	743
Total income tax provision	$ 13,022	$ 13,647	$ 11,369
U.S. tax at statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit and tax reform	3.90%	3.80%	3.70%
Excess equity compensation deduction	0.00%	(1.60%)	(1.70%)
Nondeductible expenses	2.10%	2.20%	1.60%
Total	27.00%	25.40%	24.60%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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