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Income Taxes (Reconciliation of Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of income tax computed at the U.S. federal statutory tax rate to the entity's effective income tax rate for continuing operations      
Tax at U.S. federal statutory rate (as a percent) 21.00% 21.00% 21.00%
State and local income taxes, net of U.S. federal benefit (as a percent) 2.40% 0.70% 3.10%
Other permanent items 0.90% (0.20%) (0.30%)
Stock-based compensation (as a percent) 1.20% 2.20% 0.50%
Goodwill impairment (as a percent)   2.00%  
Tax Credits (as a percent) (0.70%) (3.20%) (1.90%)
Uncertain tax positions (as a percent) 0.20% 1.30% 1.10%
Effective rate (as a percent) 25.00% 23.80% 23.40%