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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
U.S. tax at statutory rate	$ 11,274	$ 9,710	$ 9,900
Tax legislation adjustment	0	0	(4,325)
State income taxes, net of federal benefit and tax reform	2,059	1,722	1,060
Excess equity compensation deduction	(871)	(806)	(1,139)
Non-deductible expenses	1,185	743	560
Other	0	0	(24)
Total income tax provision	$ 13,647	$ 11,369	$ 6,032
U.S. tax at statutory rate	21.00%	21.00%	35.00%
Tax legislation adjustment	0.000	0.000	(0.153)
State income taxes, net of federal benefit and tax reform	3.80%	3.70%	3.70%
Excess equity compensation deduction	(1.60%)	(1.70%)	(4.00%)
Nondeductible expenses	2.20%	1.60%	2.00%
Other	0.00%	0.00%	(0.10%)
Total	25.40%	24.60%	21.30%

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