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Related Parties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Related Parties [Abstract]
Payment for expenses on behalf of the private equity funds	$ 1,833	$ 1,301	$ 1,313
Total Investment Management revenues from related parties	$ 6,696	$ 8,346	$ 5,031

Revenues arising from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's' management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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