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Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 21, 2016	Apr. 30, 2016	Mar. 31, 2016	Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items]
Distributions received from unconsolidated affiliate			$ 67,061	$ 74,847
Company's share in the earnings of equity method investee	$ 30,285	$ 37,289	59,477	71,322
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					$ 12,700
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						38.90%	39.20%
Total investment in equity method investee	41,996		41,996
Distributions received from unconsolidated affiliate			67,061	74,847
Company's share in the earnings of equity method investee	$ 30,285	$ 38,327	$ 59,477	$ 72,672
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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