Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2012
Historical Cost	$ 230,910		$ 194,100
Accumulated Amortization	(68,077)		(61,596)
Net	162,833		132,504
Trade Names [Member]
Historical Cost	65,003		50,257
Accumulated Amortization	(7,322)		(6,227)
Net	57,681		44,030
Weighted-Average Amortization Period, years	17 years	17 years 8 months 12 days
Patents And Patent Licenses [Member]
Historical Cost	44,436		44,048
Accumulated Amortization	(25,896)		(24,719)
Net	18,540		19,329
Weighted-Average Amortization Period, years	8 years 2 months 12 days	8 years 2 months 12 days
Customer Relationships [Member]
Historical Cost	105,604		86,473
Accumulated Amortization	(24,843)		(21,750)
Net	80,761		64,723
Weighted-Average Amortization Period, years	7 years 1 month 6 days	7 years
Other Purchased Intangibles [Member]
Historical Cost	15,867		13,322
Accumulated Amortization	(10,016)		(8,900)
Net	$ 5,851		$ 4,422
Weighted-Average Amortization Period, years	4 years	4 years 4 months 24 days