Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Deferred tax assets, Accruals and reserves, net	$ 14,006	$ 13,449
Deferred tax assets, Allowance for doubtful accounts	5,853	5,860
Deferred tax assets, Inventory, net	338	711
Deferred tax assets, Stock-based compensation, net	6,839	6,653
Deferred tax assets, Deferred compensation	148	294
Deferred tax assets, Net operating loss carryforwards	93,474	132,430
Deferred tax assets, Research and development tax credit	16,253	13,970
Deferred tax assets, AMT credits	3,400	1,027
Deferred Tax Assets, Other	9,105	10,711
Total deferred tax assets	149,416	185,105
Deferred tax liabilities, Prepaid expense	(13,094)	(6,762)
Deferred tax liabilities, Property and equipment, net	(2,220)	(3,271)
Deferred tax liabilities, Acquired intangibles, net	(205,775)	(213,614)
Deferred revenue	(2,438)	(11,496)
Deferred tax liabilities, Other	0	(2,227)
Total deferred tax liabilities	(223,527)	(237,370)
Net deferred tax liabilities	$ (74,111)	$ (52,265)