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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at statutory rates | $ 36,775 | $ 28,205 | $ 22,995
Increase (reduction) from: |  |  |
Jurisdictional rate differences | 2,766 | 1,989 | 1,599
Executive compensation limitations | 183 | 481 | 1,314
Valuation allowance | (789) | (316) | (269)
Stock based compensation | (24) | 122 | (322)
U.S. state taxes | 6,076 | 2,632 | 3,724
Foreign tax (credit) / expense | (371) | 267 | 0
R&D credit (net) | (3,618) | (1,585) | (782)
Other credits | (628) | 0 | 0
GILTI | 109 | 500 | 0
FDII | (731) | (192) | 0
Previously unrecognized tax (benefit) / expense | 170 | 51 | 8
Other (net) | (959) | 228 | 986
Provision for income tax | $ 38,959 | $ 32,382 | $ 29,253
Effective tax rate (percent) | 22.20% | 24.10% | 26.70%

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