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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities $ 10,172 $ 9,581
Fixed-income available-for-sale securities 75,913 74,452
Fixed-income securities owned 21,412 21,339
Investment funds sponsored by LSV 5,350 4,858
Assets, fair value 112,847 110,230
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities 10,172 9,581
Fixed-income available-for-sale securities 0 0
Fixed-income securities owned 0 0
Assets, fair value 10,172 9,581
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity available-for-sale securities 0 0
Fixed-income available-for-sale securities 75,913 74,452
Fixed-income securities owned 21,412 21,339
Assets, fair value $ 97,325 $ 95,791