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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effective Tax Rate Reconciliation |  |  |
Income tax expense at U.S. statutory rate | $ 20,800 | $ 15,600 | $ 17,900
State income taxes, net of federal tax benefit | 1,500 | 3,100 | (900)
U.S. taxation of international operations | 1,400 | 1,300 | (200)
Effective tax rate differential of earnings outside of U.S. | 1,900 | 1,800 | 2,400
Change in valuation allowance | (11,600) | (5,900) | (4,200)
Research & experimentation | (2,900) | (1,000) | (1,000)
Provision to return | 5,000 | 300 | (100)
Net non-deductible items | 400 | 2,400 | 1,200
Change in uncertain tax positions | (300) | (200) | (600)
Share-based compensation | (1,100) | (4,100) | (1,700)
Tax effect of 2017 tax reform federal rate change | 0 | 0 | (200)
Other items | 800 | 200 | 2,300
Income tax expense, net | $ 15,900 | $ 13,500 | $ 14,900

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + 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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126970579&loc=d3e23163-113944 + Details
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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act. + 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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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