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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, 2019
Dec. 31, 2018
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments $ 45,401 $ 36,278
Unfunded commitments 2,490 2,504
Money Market Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 31,590 19,719
Mutual Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 7,328 9,122
Private Equity Funds [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 2,565 3,461
Unfunded commitments 1,477 1,480
Partnership Interests [Member]    
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair value of investments 3,918 3,976
Unfunded commitments $ 1,013 $ 1,024