Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 26,228	$ 18,624
Employee benefits	17,670	16,697
Stock-based compensation	16,092	11,888
Foreign tax credits	558	7,219
Other accruals not currently deductible	1,207	6,090
Research and development credits	2,254	4,542
Uncertain tax positions	7,790	3,145
Deferred revenue	5,139	3,096
Allowance for doubtful accounts	1,661	1,259
Other	2,227	1,241
Valuation allowance	(14)	(8)
Deferred tax assets	80,812	73,793
Other intangible assets	(128,671)	(141,949)
Property and equipment	(5,838)	(6,529)
Unremitted foreign earnings	(2,204)	(140)
Deferred tax liabilities	(136,713)	(148,618)
Net deferred tax liability	$ (55,901)	$ (74,825)