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]
Net operating loss carryforwards	$ 18,624	$ 12,402
Employee benefits	16,697	14,788
Stock-based compensation	11,888	8,916
Foreign tax credits	7,219	4,398
Other accruals not currently deductible	6,090	8,386
Research and development credits	4,542	1,429
Uncertain tax positions	3,145	3,084
Deferred revenue	3,096	5,089
Allowance for doubtful accounts	1,259	1,587
Investments	0	229
Other	1,241	588
Valuation allowance	(8)	(977)
Deferred tax assets	73,793	59,919
Other intangible assets	(141,949)	(108,071)
Property and equipment	(6,529)	(3,430)
Unremitted foreign earnings	(140)	(171)
Deferred tax liabilities	(148,618)	(111,672)
Net deferred tax liabilities	$ (74,825)	$ (51,753)