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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at statutory rates | $ 22,995 | $ 16,749 | $ 17,765
Increase (reduction) from: |  |  |
Jurisdictional rate differences | 1,599 | 1,034 | 988
Executive compensation limitation | 1,314 | 170 | 715
Stock based compensation | (322) | (366) | (358)
U.S. state taxes | 3,724 | 2,556 | 3,137
Foreign tax expense | 0 | 704 | 0
R&D credit | (670) | (415) | (699)
GILTI | 0 | 50 | 872
Previously unrecognized tax (benefit)/expense | 8 | 2,219 | (1,504)
Other, net | 605 | (748) | 580
Provision for income taxes | $ 29,253 | $ 21,953 | $ 21,496
Effective tax rate | 27.00% | 28.00% | 25.00%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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