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Restructuring (Details) (Equities division, USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2011 item	Sep. 30, 2011	Sep. 30, 2012
Restructuring
Number of employees impacted	62
Changes in the company's liability related to restructuring
Balance at the beginning of the period			$ 1,427
Restructuring expense		7,300	(322)
Less: Non-cash charges			85
Balance at the end of the period			291
Real estate
Changes in the company's liability related to restructuring
Payments for restructuring			(217)
Third party vendor contracts
Changes in the company's liability related to restructuring
Payments for restructuring			$ (682)

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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