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Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Cost Of Revenue [Member]
Stock-based compensation expense	$ 456	$ 438	$ 1,308	$ 1,279
Product Development [Member]
Stock-based compensation expense	176	164	548	471
Selling, General And Administrative [Member]
Stock-based compensation expense	$ 2,113	$ 2,248	$ 6,857	$ 6,929

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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