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Cash and Marketable Securities (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Marketable Securities [Line Items]    
Proceeds from sales of securities $ 0 $ 48,000,000
Available for sale securities, maturities 0 12,000,000
Available for sale securities, gross realized gains 0 1,000,000
Available for sale securities, gross realized losses 0 1,000,000
Impairment charges due to other than temporary declines in value of certain investments $ 0 $ 0