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Cash and Marketable Securities (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Marketable Securities [Line Items]        
Proceeds from sales of securities $ 0   $ 0 $ 48,000,000
Available for sale securities, maturities 0   0 12,000,000
Available for sale securities, gross realized gains 0   0  
Available for sale securities, gross realized losses $ 0   0  
Impairment charges due to other than temporary declines in value of certain investments     $ 0 0
Maximum [Member]        
Marketable Securities [Line Items]        
Proceeds from sales of securities   $ 1,000,000    
Available for sale securities, maturities   1,000,000    
Available for sale securities, gross realized gains   1,000,000   1,000,000
Available for sale securities, gross realized losses   $ 1,000,000   $ 1,000,000