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Income Taxes - Effective tax rate (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Taxes        
U.S. federal statutory income tax rate     21.00% 21.00%
Effective tax rate 26.20% 24.10% 25.90% 25.30%