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Income taxes - Schedule of Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amount |  |  |
U.S. federal statutory income tax | $ 9,806 | $ 9,497 | $ 47,176
U.S. state and local income taxes, net of U.S. federal income tax benefits | 4,150 | 3,110 | 13,585
Unrecognized tax benefit | 45 | 180 | 59
Valuation allowance | 964 | 1,054 | 1,121
Non-taxable income | (964) | (1,083) | (430)
Provision to return adjustments | (812) | (316) | 281
Change in state and foreign tax rates | (514) | (660) | 1,384
Foreign tax rate differentials | (146) | (285) | (223)
Excess tax benefits from share-based awards | (1,378) | (471) | (1,542)
Non-deductible executive compensation | 1,514 | 1,605 | 3,956
Other non-deductible expenses | 3,833 | 813 | 310
Total income taxes | $ 16,498 | $ 13,444 | $ 65,677
Percentage |  |  |
U.S. federal statutory income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
U.S. state and local income taxes, net of U.S. federal income tax benefits (as a percent) | 8.90% | 6.80% | 6.00%
Unrecognized tax benefits (as a percent) | 0.10% | 0.40% | 0.00%
Valuation allowance (as a percent) | 2.10% | 2.30% | 0.50%
Non-taxable income (as a percent) | (2.10%) | (2.40%) | (0.20%)
Provision to return adjustments (as a percent) | (1.70%) | (0.70%) | 0.10%
Change in state and foreign tax rates (as a percent) | (1.10%) | (1.40%) | 0.60%
Foreign tax rate differentials (as a percent) | (0.30%) | (0.60%) | (0.10%)
Excess tax benefits from share-based awards (as a percent) | (2.90%) | (1.00%) | (0.70%)
Non-Deductible Executive Compensation (as a percent) | 3.20% | 3.50% | 1.80%
Other non-deductible expenses (as a percent) | 8.10% | 1.60% | 0.20%
Total income tax expense (as a percent) | 35.30% | 29.50% | 29.20%

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