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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
Mar. 31, 2023
Dec. 31, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments $ 28,472 $ 25,612
Unfunded commitments 9,662 11,034
Partnership Interests [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 20,532 18,817
Unfunded commitments 8,481 9,853
Mutual Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 4,955 4,728
Money Market Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 2,569 1,650
Private Equity Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 416 417
Unfunded commitments $ 1,181 $ 1,181