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Investments in Securities and Fair Value Investments in Securities (Schedule of Equity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost $ 25,980 $ 22,981
Common stocks 39,893 37,212
Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost 25,980 22,981
Common stocks $ 39,893 $ 37,212