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Income Taxes - Reconciliation Of Provision Of Income Taxes (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes (net of federal income tax benefit) | 1.60% | 1.40% | 2.20%
Foreign income tax rate differential | 3.30% | 0.80% | 1.10%
Revaluation of deferred tax assets for foreign and state tax rate changes, net | (1.90%) | (1.00%) | (1.30%)
Loss on sale of subsidiary | (2.30%) | 0.00% | 0.00%
Legal settlement | (5.10%) | 0.00% | 0.00%
Purchase accounting adjustments | 4.30% | 0.00% | 0.00%
Research and development credit | 0.00% | (0.50%) | (0.20%)
Tax reserves | (0.10%) | 0.80% | 2.00%
Withholding taxes | (0.10%) | 0.70% | 0.20%
2017 Tax Act | 0 | 0 | (0.002)
Change in valuation allowance | (13.50%) | 3.10% | 4.50%
Nondeductible expenses | (1.60%) | 2.30% | 1.40%
Incremental tax benefit from share-based compensation awards | 0.20% | (2.00%) | (1.70%)
GILTI | 0.00% | 0.50% | 0.80%
Other | 1.00% | 1.20% | (0.90%)
Effective tax rate | 6.80% | 28.30% | 28.90%

X
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- Definition Percentage 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 changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: 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=84230637&loc=d3e32687-109319 + Details
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