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Income Taxes - Income tax rate reconciliation (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00%
Non-deductibility of goodwill | 0.80% | 0.00% | (17.90%)
Non-deductibility of officer's compensation | 2.90% | 2.20% | (0.90%)
State and other taxes, net of federal tax benefit | 3.10% | 3.10% | 1.20%
Excess tax deficiencies or benefits | (0.50%) | (7.10%) | 0.10%
Change in unrecognized tax benefits | 0.00% | (0.10%) | 2.00%
Change in valuation allowance | (0.30%) | 0.50% | (1.50%)
Changes in tax rates and state tax laws | 3.40% | 0.20% | (0.40%)
General business credits | (1.40%) | (0.90%) | 0.80%
Other | 0.30% | 0.80% | (0.20%)
Effective tax rate | 29.30% | 19.70% | 4.20%

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