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Accounting for Income Taxes
 3 Months Ended
Mar. 31, 2023
Notes To Financial Statements [Abstract]  
Accounting for Income Taxes Accounting for Income Taxes
Our provision for income taxes was $46.8 million and $53.2 million for the three months ended March 31, 2023 and 2022, respectively, representing effective tax rates of 34.8% and 28.4%, respectively. Our effective tax rate differs from the statutory federal income tax rate of 21% for both the three months ended March 31, 2023 and 2022 primarily due to the recognition of additional tax expense resulting from foreign income taxed at different rates, state income taxes, and non-deductible expenses in the U.S.

We exercise significant judgment in regards to estimates of future market growth, forecasted earnings and projected taxable income in determining the provision for income taxes and for purposes of assessing our ability to utilize any future benefit from deferred tax assets. We continue to assess the realizability of the deferred tax assets as we take into account new information.

Our total gross unrecognized tax benefits, excluding interest and penalties, were $145.3 million and $141.6 million as of March 31, 2023 and December 31, 2022, respectively, a material amount of which would impact our effective tax rate if recognized. The increase in our unrecognized tax benefits relates primarily to positions taken on income tax return calculations finalized during the three months ended March 31, 2023.