Goodwill And Intangible Assets (Schedule Of Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Historical Cost	$ 779,790	$ 529,008
Accumulated Amortization	(300,910)	(209,178)
Net	$ 478,880	$ 319,830
Trade names
Weighted-Average Amortization Period, years	11 years 6 months	12 years
Historical Cost	$ 127,342	$ 117,753
Accumulated Amortization	(38,868)	(26,167)
Net	88,474	91,586
Fair Value	$ 5,866	$ 22,602	$ 28,192
Patent and patent licenses
Weighted-Average Amortization Period, years	6 years 7 months 6 days	8 years 3 months 18 days
Historical Cost	$ 65,605	$ 64,258
Accumulated Amortization	(51,677)	(45,417)
Net	$ 13,928	$ 18,841
Customer relationships
Weighted-Average Amortization Period, years	9 years 7 months 6 days	9 years 4 months 24 days
Historical Cost	$ 390,930	$ 313,909
Accumulated Amortization	(182,775)	(116,590)
Net	208,155	197,319
Fair Value	$ 85,482	$ 98,027	98,498
Other purchased intangibles
Weighted-Average Amortization Period, years	6 years	4 years 2 months 12 days
Historical Cost	$ 195,913	$ 33,088
Accumulated Amortization	(27,590)	(21,004)
Net	168,323	12,084
Fair Value	91,264	1,873	$ 2,121
Trademarks
Fair Value	70,300
EVDY [Member]
Fair Value	$ 204,067
EVDY [Member] | Customer relationships
Weighted-Average Amortization Period	10 years 1 month 6 days
Fair Value	$ 45,500
EVDY [Member] | Other purchased intangibles
Weighted-Average Amortization Period	1 year 8 months 12 days
Fair Value	$ 88,267
EVDY [Member] | Trademarks
Weighted-Average Amortization Period	5 years 2 months 12 days
Fair Value	$ 70,300
2016 Business Acquisition [Member]
Fair Value	$ 48,845
2016 Business Acquisition [Member] | Trade names
Weighted-Average Amortization Period	6 years 3 months 18 days
Fair Value	$ 5,866
2016 Business Acquisition [Member] | Customer relationships
Weighted-Average Amortization Period	7 years 6 months
Fair Value	$ 39,982
2016 Business Acquisition [Member] | Other purchased intangibles
Weighted-Average Amortization Period	3 years 3 months 18 days
Fair Value	$ 2,997
2015 Business Acquisition [Member]
Fair Value		$ 122,502
2015 Business Acquisition [Member] | Trade names
Weighted-Average Amortization Period		4 years 7 months 6 days
Fair Value		$ 22,602
2015 Business Acquisition [Member] | Customer relationships
Weighted-Average Amortization Period		7 years 4 months 24 days
Fair Value		$ 98,027
2015 Business Acquisition [Member] | Other purchased intangibles
Weighted-Average Amortization Period		3 years 8 months 12 days
Fair Value		$ 1,873