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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost $ 23,176 $ 25,278
Equity securities, estimated fair value 42,800 51,691
Common stocks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost 23,176 25,278
Equity securities, estimated fair value $ 42,800 $ 51,691