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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes

7.   Income Taxes. Our provision for income taxes for the three-month periods ended September 30, 2021 and 2020 was a tax expense of approximately $2.2 million and $0.8 million, respectively, which resulted in an effective tax rate of 15.6% and (37.7)%, respectively. Our provision for income taxes for the nine-month periods ended September 30, 2021 and 2020 was a tax expense (benefit) of approximately $5.9 million and ($1.3) million, respectively, which resulted in an effective tax rate of 17.5% and 4.7%, respectively. The increase in the income tax expense and the corresponding change in the effective income tax rate for the three and nine-month periods ended September 30, 2021, when compared to the prior-year periods, was primarily due to a pre-tax loss during the 2020 periods, as well as a change in the jurisdictional mix of earnings. Our effective tax rate differs from the U.S. statutory rate primarily due to the impact of global intangible low-taxed income (“GILTI”) inclusions, state income taxes, foreign taxes, other non-deductible permanent items and discrete items (such as share-based compensation).