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Investment In Unconsolidated Affiliates (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Apr. 24, 2013 LSV Employee Group II [Member]	Apr. 11, 2011 LSV Employee Group II [Member]	Oct. 02, 2012 LSV Employee Group III [Member]	Mar. 31, 2013 Maximum [Member]	Apr. 24, 2013 Financial Guarantee [Member] L S V Asset Management [Member]	Oct. 02, 2012 Financial Guarantee [Member] L S V Asset Management [Member]	Apr. 24, 2013 Financial Guarantee [Member] LSV Employee Group II [Member]	Apr. 11, 2011 Financial Guarantee [Member] LSV Employee Group II [Member]	Apr. 24, 2013 Financial Guarantee [Member] LSV Employee Group III [Member]	Oct. 02, 2012 Financial Guarantee [Member] LSV Employee Group III [Member]	Mar. 31, 2013 L S V Asset Management [Member]	Mar. 31, 2012 L S V Asset Management [Member]	Apr. 24, 2013 L S V Asset Management [Member]	Mar. 31, 2013 Gao Fu [Member]
Investments in and Advances to Affiliates [Line Items]
Equity method investment, ownership percentage						50.00%							39.80%		39.30%
Total investment in equity method investee													$ 68,701			$ 8,464
Investment in equity method investee in excess of underlying equity													3,171
Goodwill													3,062
Partnership distribution payments received from LSV	27,821	21,593
Company's share in the earnings of equity method investee	27,588	27,330											27,806	27,330		(218)
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned				4,300	77,700
Loans Payable			1,641		69,930
Guarantor Obligations, Maximum Exposure, Undiscounted							19,723	24,930		3,655	45,000	45,000
Guarantor Obligations, Current Carrying Value									$ 0		$ 0

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