Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of revenue by product type
Revenue by type, Total	$ 549,332	$ 423,344	$ 319,566
Video processing products [Member]
Summary of revenue by product type
Revenue by type, Total	236,624	202,898	162,654
Production and playout products [Member]
Summary of revenue by product type
Revenue by type, Total	98,842	32,579
Edge and access products [Member]
Summary of revenue by product type
Revenue by type, Total	141,880	135,306	117,355
Service and support [Member]
Summary of revenue by product type
Revenue by type, Total	$ 71,986	$ 52,561	$ 39,557