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Income Taxes
 3 Months Ended
Mar. 31, 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 March 31, 2022 and 2021 due to the following (in thousands):
 20222021
Computed “expected” tax expense$61,881 21.0 %$49,493 21.0 %
Changes resulting from:
Foreign income tax differential(2,015)(0.7)%(3,830)(1.6)%
Excess tax benefit related to stock-based compensation(3,210)(1.1)%(9,413)(4.0)%
State taxes net of federal benefits4,992 1.7 %2,685 1.1 %
Foreign withholding3,199 1.1 %3,643 1.5 %
GILTI, net of foreign tax credits1,288 0.4 %2,992 1.3 %
Nondeductible stock-based compensation1,430 0.5 %797 0.3 %
Increase in tax expense due to uncertain tax positions1,664 0.6 %2,412 1.0 %
Sub-part F Income3,654 1.2 %1,326 0.6 %
Other3,835 1.3 %1,336 0.6 %
Provision for income taxes$76,718 26.0 %$51,441 21.8 %