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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
 Three Months Ended March 31,
 20212020
(in thousands, except percentages)
Income before income taxes$207,867 $161,819 
Provision for income taxes27,501 23,388 
Effective tax rate13.2 %14.5 %
    The effective tax rates above reflect tax expense recorded on pre-tax income in the three months ended March 31, 2021 and March 31, 2020. The change in effective tax rate in the three months ended March 31, 2021, as compared to the same period in 2020, was primarily due to an increase in tax benefits attributable to stock-based awards.