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Investments in Securities and Fair Value Investments in Securities (Schedule of Equity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost $ 25,278 $ 29,478
Common stocks 51,691 76,853
Common Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, cost 25,278 29,478
Common stocks $ 51,691 $ 76,853