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Consolidated Statements of Operations Consolidated Statements of Income Parentheticals (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity-based compensation	$ 25,537	$ 21,884	$ 20,444
Compensation and benefits [Member]
Equity-based compensation	19,098	17,086	14,891
Acquisition retention expenses [Member]
Equity-based compensation	2,908	1,054	11
Selling, general and administrative [Member]
Equity-based compensation	$ 3,531	$ 3,744	$ 5,542

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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