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Income Taxes Income Taxes (Table 3) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]        
Income taxes at federal statutory rate 21.00% 21.00% 21.00%  
Effects of foreign operations 0.40% (0.20%) (0.80%)  
Stock-based compensation (1.80%) (0.50%) (2.40%)  
State and local income taxes - net of federal income tax benefit 1.90% 2.00% 2.10%  
Nondeductible items 0.30% 0.50% 1.20%  
Valuation allowance (0.10%) 0.10% (0.50%)  
Other (0.60%) 0.20% (0.10%)  
Effective tax rate 21.10% 23.10% 20.50%  
Unrecognized Tax Benefits $ 238 $ 1,145 $ 1,145 $ 2,295