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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Selling and marketing with a related party	$ 205,027	$ 211,018	$ 171,110
Cost Of Revenue
Stock-based compensation	3,296	2,971	2,401
Selling and Marketing Expense
Stock-based compensation	13,474	13,085	11,766
Technology and Content Expense
Stock-based compensation	16,073	13,505	11,665
General and Administrative Expense
Stock-based compensation	$ 31,753	$ 34,286	$ 26,675

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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