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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Income tax expense decreased by $3.6 million to $10.5 million for the three months ended September 30, 2021 compared to $14.1 million for the three months ended September 30, 2020. The Company’s effective tax rate ("ETR") was 20.8% for the three months ended September 30, 2021 compared to 18.1% for the three months ended September 30, 2020. Income tax expense increased by $41.7 million to $62.9 million for the nine months ended September 30, 2021 compared to $21.2 million for the nine months ended September 30, 2020. The Company’s ETR was 23.1% for the nine months ended September 30, 2021 compared to 21.6% for the nine months ended September 30, 2020.
The ETR for the three and nine months ended September 30, 2021 differed from the U.S. statutory tax rate primarily due to the U.S. taxation of foreign income and the Company's geographic mix of income, partially offset by the impact of the U.S. deduction for foreign derived intangible income and federal and state tax credits. The ETR for the three and nine months ended September 30, 2020 differed from the U.S. statutory tax rate primarily due to the U.S. taxation of foreign income and the Company's geographic mix of income, as well as discrete tax benefits related to both a reduction of foreign withholding taxes and U.S. taxation of foreign earnings.