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Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cost of Revenue [Member]
Stock-based compensation expense	$ 425	$ 438	$ 852	$ 841
Product Development [Member]
Stock-based compensation expense	187	156	372	307
Selling, General and Administrative [Member]
Stock-based compensation expense	$ 2,414	$ 2,493	$ 4,744	$ 4,681

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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