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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
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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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