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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2021
Income Tax Disclosure [Abstract] |
Summary of Provision for Income Taxes and U.S. Federal Tax Rate | The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 21% for 2021 and 2020 to income before income taxes for the three months ended June 30, 2021 and 2020 due to the following (in thousands):
|  | 2021 |  | 2020
Computed “expected” tax expense |  | $ | 55,129 |  |  | 21.0 | % |  | $ | 44,443 |  |  | 21.0 | %
Changes resulting from: |  |  |  |  |  |  |  |
Foreign income tax differential |  | (3,899) |  |  | (1.5) | % |  | (4,155) |  |  | (2.0) | %
Excess tax benefit related to stock-based compensation |  | (6,059) |  |  | (2.3) | % |  | (12,720) |  |  | (6.0) | %
State taxes net of federal benefits |  | 2,949 |  |  | 1.1 | % |  | 3,902 |  |  | 1.8 | %
Change in UK statutory rate |  | 6,470 |  |  | 2.5 | % |  | — |  |  | — | %
Foreign withholding |  | (316) |  |  | (0.1) | % |  | 3,515 |  |  | 1.7 | %
GILTI, net of foreign tax credits |  | 2,899 |  |  | 1.1 | % |  | 2,402 |  |  | 1.1 | %
Foreign sourced non taxable income |  | 50 |  |  | — | % |  | 13 |  |  | — | %
Change in taxes for federal uncertain tax positions |  | 4,800 |  |  | 1.8 | % |  | 12,261 |  |  | 5.8 | %
Other |  | 4,249 |  |  | 1.6 | % |  | 3,479 |  |  | 1.7 | %
Provision for income taxes |  | $ | 66,272 |  |  | 25.2 | % |  | $ | 53,140 |  |  | 25.1 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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