Goodwill and Acquired Intangibles (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	$ 249,058	$ 264,776
Accumulated Amortization	(82,530)	(91,542)
Acquired Intangibles, net	166,528	173,234
Existing Technology [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	90,667	90,433
Accumulated Amortization	(20,037)	(17,119)
Acquired Intangibles, net	70,630	73,314
Agreements and relationships [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	117,108	118,060
Accumulated Amortization	(29,050)	(27,123)
Acquired Intangibles, net	88,058	90,937
Distribution rights [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	30,100	30,100
Accumulated Amortization	(26,338)	(25,585)
Acquired Intangibles, net	3,762	4,515
Tradenames Trademarks And Patents [Member]
Acquired intangibles with finite lives, excluding intangibles fully amortized at end of prior fiscal year
Gross Carrying Amount	11,183	26,183
Accumulated Amortization	(7,105)	(21,715)
Acquired Intangibles, net	$ 4,078	$ 4,468