Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Historical Cost	$ 805,507	$ 779,790
Accumulated Amortization	(396,385)	(300,910)
Net	$ 409,122	$ 478,880
Trade Names [Member]
Weighted-Average Amortization Period, years	11 years 6 months	11 years 6 months
Historical Cost	$ 127,525	$ 127,342
Accumulated Amortization	(48,191)	(38,868)
Net	$ 79,334	$ 88,474
Patents And Patent Licenses [Member]
Weighted-Average Amortization Period, years	6 years 7 months 6 days	6 years 7 months 6 days
Historical Cost	$ 66,829	$ 65,605
Accumulated Amortization	(55,597)	(51,677)
Net	$ 11,232	$ 13,928
Customer Relationships [Member]
Weighted-Average Amortization Period, years	9 years 4 months 24 days	9 years 7 months 6 days
Historical Cost	$ 414,996	$ 390,930
Accumulated Amortization	(236,186)	(182,775)
Net	$ 178,810	$ 208,155
Other Purchased Intangibles [Member]
Weighted-Average Amortization Period, years	5 years 2 months 12 days	6 years
Historical Cost	$ 196,157	$ 195,913
Accumulated Amortization	(56,411)	(27,590)
Net	$ 139,746	$ 168,323