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Income Taxes
 9 Months Ended
Sep. 30, 2024
Income Tax Disclosure [Abstract]  
Income Taxes
10. Income Taxes
Our income tax provision (benefit) and effective income tax rates, including the effects of period-specific events, were:
  
Three months ended
September 30,
Nine months ended
September 30,
(dollars in thousands)
2024
2023
2024
2023
Income tax provision (benefit)$12,140 $9,069 $18,567 $(5,032)
Effective income tax rate37.1 %50.1 %28.1 %58.4 %
The changes in our effective income tax rates for the three and nine months ended September 30, 2024, when compared to the same periods in 2023 were primarily attributable the negative impact in 2023 of non-deductible accruals related to the Security Incident that did not recur in 2024 to the same extent. Additionally, there were favorable impacts of benefits attributable to stock-based compensation. Partially offsetting these items were unfavorable impacts of our United Kingdom liability for uncertain tax positions.