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Fair Value Of Financial Instruments (Schedule Of Fair Value Of Investments In And Unfunded Commitments To Funds Measured At Net Asset Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments $ 62,225 $ 38,955
Unfunded commitments 2,098 2,156
Money Market Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 51,541 25,734
Mutual Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 5,698 7,875
Private Equity Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 1,697 2,288
Unfunded commitments 1,203 1,203
Partnership Interests [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 3,289 3,058
Unfunded commitments $ 895 $ 953