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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, Cost $ 34,903 $ 33,570
Equity Securities, Estimated Fair Value 47,983 61,108
Common stocks    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, Cost 34,903 33,570
Equity Securities, Estimated Fair Value $ 47,983 $ 61,108