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Income Taxes - Reconciliation Of Income Tax Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount |  |  |
Statutory rate | $ 2,936 | $ 5,069 | $ (5,159)
Foreign tax rate differential | 65 | 129 | 156
State income taxes, net of federal benefit | 1,003 | 83 | (700)
Non-deductible expenses | 181 | 278 | 219
Tax benefits related to disposition of the Test and Inspection Services business | (16,282) | 0 | 0
Global intangible low-taxed income, net of tax credits | 621 | 145 | 171
Income tax credits | (1,357) | (126) | (633)
Nondeductible executive compensation | 132 | 234 | 351
Tax on unremitted foreign earnings | 174 | 216 | 149
Change in valuation allowance | 731 | (29,966) | 11,400
Other | (45) | 103 | 63
Total income tax expense | $ (11,841) | $ (23,835) | $ 6,017
Effective Income Tax Rate Reconciliation, Percent |  |  |
Statutory rate | 21.00% | 21.00% | 21.00%
Foreign tax rate differential | 0.50% | 0.50% | (0.60%)
State income taxes, net of federal benefit | 7.20% | 0.30% | 2.80%
Non-deductible expenses | 1.30% | 1.20% | (0.90%)
Tax benefits related to disposition of the Test and Inspection Services business | (116.40%) | 0.00% | 0.00%
Global intangible low-taxed income, net of tax credits | 4.40% | 0.60% | (0.70%)
Income tax credits | (9.70%) | (0.50%) | 2.60%
Nondeductible executive compensation | 0.90% | 1.00% | (1.40%)
Tax on unremitted foreign earnings | 1.20% | 0.90% | (0.60%)
Change in valuation allowance | 5.20% | (124.10%) | (46.40%)
Other | (0.30%) | 0.40% | (0.30%)
Total income tax expense/ Effective rate | (84.70%) | (98.70%) | (24.50%)

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