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Income Taxes
 3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
Our quarterly provision for income taxes is based on an estimated effective annual income tax rate. Our quarterly provision for income taxes also includes discrete items, such as changes in valuation allowances or adjustments upon finalization of tax returns as well as infrequently occurring items, if any, such as the effects of changes in tax laws or rates, in the interim period in which they occur.
We recorded a tax benefit of $0.6 million and $1.7 million for the three months ended March 31, 2022 and 2021, respectively. Lower losses in our foreign operations in the quarter ended March 31, 2022 compared to the quarter ended March 31, 2021 resulted in a lower tax benefit for our foreign operations for the three months ended March 31, 2022 compared to the prior year period.
Our tax benefit for the periods presented in this report differs from the 21% U.S. Federal statutory rate principally because we maintain a valuation allowance for our domestic deferred tax assets, which primarily consist of net-operating loss carryforwards.
Recording deferred tax assets is appropriate when realization of these assets is more likely than not. Assessing the realizability of deferred tax assets is dependent upon several factors including historical financial results and future expected financial results. Domestic deferred tax assets have been offset by valuation allowances. Any release of valuation allowances could have the effect of decreasing the income tax provision in the period the valuation allowance is released. We continue to assess the likelihood that we will be able to recover our deferred tax assets, including those for which a valuation allowance is recorded. There can be no assurance that we will generate profits in the future periods enabling us to fully realize our deferred tax assets. The timing of recording a valuation allowance or the reversal of such valuation allowance is subject to objective and subjective factors that cannot be readily predicted in advance.
Our tax positions are subject to audits by multiple tax jurisdictions. We believe that we have provided adequate reserves for uncertain tax positions for all tax years still open for assessment. For the three months ended March 31, 2022 and 2021, respectively, we did not recognize any material interest or penalties related to uncertain tax positions.