Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Historical Cost	$ 125,255	$ 109,603
Accumulated Amortization	(56,510)	(45,107)
Net	68,745	64,496
Weighted-Average Amortization Period, years	1 year 6 months
Tradename [Member]
Historical Cost	12,520	10,584
Accumulated Amortization	(5,502)	(4,147)
Net	7,018	6,437
Weighted-Average Amortization Period, years	10 years 10 months 24 days	12 years 7 months 6 days
Patents And Patent Licenses [Member]
Historical Cost	42,014	38,229
Accumulated Amortization	(23,593)	(20,712)
Net	18,421	17,517
Weighted-Average Amortization Period, years	9 years 1 month 6 days	8 years 4 months 24 days
Customer Relationships [Member]
Historical Cost	58,962	49,245
Accumulated Amortization	(19,174)	(13,380)
Net	39,788	35,865
Weighted-Average Amortization Period, years	6 years 7 months 6 days	6 years 8 months 12 days
Other Purchased Intangibles [Member]
Historical Cost	11,759	11,545
Accumulated Amortization	(8,241)	(6,868)
Net	$ 3,518	$ 4,677
Weighted-Average Amortization Period, years	4 years 9 months 18 days	4 years 8 months 12 days