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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Apr. 30, 2016	Mar. 31, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 75,142	$ 67,061
Company's share in the earnings of equity method investee	$ 36,315	$ 30,285	69,880	59,477
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
LSV Employee Group III [Member] | Financial Guarantee [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure							45,000
L S V Asset Management [Member] | Financial Guarantee [Member]
Investments in and Advances to Affiliates [Line Items]
Amount of guarantor's obligation, maximum exposure							$ 24,930
L S V Asset Management [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage					38.90%	39.20%
Total investment in equity method investee	45,197		45,197
Distributions received from unconsolidated affiliate			75,142	67,061
Company's share in the earnings of equity method investee	$ 36,315	$ 30,285	$ 69,880	$ 59,477
Maximum [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage	50.00%		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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