Consolidated Statements Of Operations (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Stock-based compensation expense	$ 11,612,000	[1]	$ 11,233,000	[1]	$ 16,989,000	[1]
Cost Of Revenue [Member]
Stock-based compensation expense	1,791,000		1,640,000		2,354,000
Product Development [Member]
Stock-based compensation expense	735,000		614,000		755,000
Selling, General And Administrative [Member]
Stock-based compensation expense	$ 9,086,000		$ 8,979,000		$ 13,880,000

[1] Included in stock-based compensation expense for the year ended December 31, 2009 was $3.9 million of stock-based compensation expense related to the realignment of our workforce and business on January 5, 2009. For further information about the realignment of our workforce and business, please refer to Note 15.