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Income Taxes
 6 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 21% for 2022 and 2021 to income before income taxes for the three months ended June 30, 2022 and 2021 due to the following (in thousands):
 20222021
Computed expected tax expense$72,167 21.0 %$55,129 21.0 %
Changes resulting from:
Foreign income tax differential(1,073)(0.3)%(3,899)(1.5)%
Excess tax benefit related to stock-based compensation(6,336)(1.8)%(6,059)(2.3)%
State taxes net of federal benefits6,699 2.0 %2,949 1.1 %
Foreign withholding3,624 1.1 %(316)(0.1)%
Change in indefinite reinvestment - Russia(9,049)(2.6)%— — %
GILTI, net of foreign tax credits1,396 0.4 %2,899 1.1 %
Change in UK Statutory Rate— — %6,470 2.5 %
Increase in tax expense due to uncertain tax positions2,137 0.6 %4,800 1.8 %
Sub-part F Income5,470 1.6 %1,562 0.6 %
Nondeductible stock-based compensation1,640 0.5 %725 0.3 %
Other4,806 1.4 %2,012 0.8 %
Provision for income taxes$81,482 23.7 %$66,272 25.2 %