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Fair Value Measurements (Fair Value Of Certain Financial Assets And Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity available-for-sale securities	$ 10,863	$ 9,581
Fixed-income available-for-sale securities	71,389	74,452
Fixed-income securities owned	21,469	21,339
Investment funds sponsored by LSV	5,738	4,858
Assets, fair value	109,459	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	10,863	9,581
Fixed-income available-for-sale securities	0	0
Fixed-income securities owned	0	0
Assets, fair value	10,863	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	71,389	74,452
Fixed-income securities owned	21,469	21,339
Assets, fair value	92,858	$ 95,791
Significant And Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	$ 4,800

X

- Definition

Fair value of investment in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes measurement of net asset value as estimate of fair value.

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