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Properties And Equipment (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Properties And Equipment [Abstract]      
Net book value of computer software $ 8.1 $ 8.0  
Depreciation expense for computer software $ 4.3 $ 4.5 $ 5.5