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Stock Options And Employee Stock Purchase Plan (Allocation Of Share-Based Compensation Expense) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total share-based compensation expense	$ 2,248	$ 2,777	$ 6,684	$ 8,767
Cost Of Revenues [Member]
Total share-based compensation expense	246	304	736	963
Sales And Marketing [Member]
Total share-based compensation expense	350	464	1,049	1,460
Research, Development And Engineering [Member]
Total share-based compensation expense	110	204	367	645
General And Administrative [Member]
Total share-based compensation expense	$ 1,542	$ 1,805	$ 4,532	$ 5,699

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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