Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Historical Cost	$ 561,070	$ 529,008
Accumulated Amortization	(231,192)	(209,178)
Net	329,878	319,830
Trade Names [Member]
Historical Cost	126,672	117,753
Accumulated Amortization	(29,297)	(26,167)
Net	$ 97,375	$ 91,586
Weighted-Average Amortization Period, years	12 years	12 years
Patents And Patent Licenses [Member]
Historical Cost	$ 64,415	$ 64,258
Accumulated Amortization	(47,071)	(45,417)
Net	$ 17,344	$ 18,841
Weighted-Average Amortization Period, years	8 years 2 months 12 days	8 years 3 months 18 days
Customer Relationships [Member]
Historical Cost	$ 335,045	$ 313,909
Accumulated Amortization	(132,693)	(116,590)
Net	$ 202,352	$ 197,319
Weighted-Average Amortization Period, years	10 years	9 years 4 months 24 days
Other Purchased Intangibles [Member]
Historical Cost	$ 34,938	$ 33,088
Accumulated Amortization	(22,131)	(21,004)
Net	$ 12,807	$ 12,084
Weighted-Average Amortization Period, years	4 years 7 months 6 days	4 years 2 months 12 days