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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, Cost $ 28,967 $ 32,478
Equity Securities, Estimated Fair Value 64,646 64,919
Common stocks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, Cost 28,967 32,478
Equity Securities, Estimated Fair Value $ 64,646 $ 64,919