Goodwill and Identified Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Omneon [Member]	Dec. 31, 2010 Omneon [Member]	Sep. 15, 2010 Omneon [Member]	Dec. 31, 2011 Scopus [Member]	Dec. 31, 2010 Scopus [Member]	Dec. 31, 2009 Scopus [Member]	Mar. 12, 2009 Scopus [Member]
Changes in the carrying amount of goodwill
Balance at beginning of period	$ 211,878	$ 63,953
Adjustment to deferred tax liability associated with the acquisition			(527)			0	786
Adjustment to fixed assets associated with the acquisition of Omneon			298
Adjustment to income tax payable associated with the acquisition of Omneon			771
Acquisition of Omneon			0	147,208	147,800	0		22,847	22,800
Foreign currency translation adjustments	(3)	(69)
Balance at end of period	$ 212,417	$ 211,878