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Income Taxes
 9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes (in thousands, except percentages)
 Three Months Ended September 30,Nine Months Ended September 30,
 2024202320242023
Income before income taxes$882,910 $644,510 $2,376,107$1,727,635 
Provision for income taxes134,972 99,183 $325,049253,950 
Effective tax rate15.3 %15.4 %13.7 %14.7 %
    The decrease in the effective tax rates in the three and nine months ended September 30, 2024, as compared to the same periods in 2023, was primarily due to a change in the jurisdictional mix of earnings.