Employee Benefits And Stock-Based Compensation (Classification Of Stock-Based Compensation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	$ 43,272	$ 36,338	$ 29,586
Discontinued operations		15,840	21,580
Total stock-based compensation	43,272	52,178	51,166
Cost Of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	6,655	4,473	3,649
Sales And Marketing [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	6,062	4,419	3,250
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	4,926	4,989	3,145
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	19,928	20,136	18,912
Restructuring And Impairment Charges [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation for continuing operations	$ 5,701	$ 2,321	$ 630