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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 13, 2017	Apr. 30, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate	$ 35,265	$ 34,525
Company's share in the earnings of equity method investee	33,565	$ 29,192
LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Purchase of partnership interest value					$ 77,700
Amount of purchase price financed through term loans					69,930
Financial Guarantee [Member] | L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure					24,930
Financial Guarantee [Member] | LSV Employee Group III [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure					$ 45,000
Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure			$ 1,065
Amount of guarantor's obligation, current carrying value			$ 0
L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage		39.20%		38.90%
Total investment in equity method investee	48,759
Distributions received from unconsolidated affiliate	35,265	$ 34,525
Company's share in the earnings of equity method investee	$ 33,565	$ 29,192
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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