Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible Assets [Abstract]
Gross carrying amount	$ 916,196		$ 916,196		$ 885,927
Accumulated amortization	774,207		774,207		743,975
Intangible assets, fair value	141,989		141,989
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	689,873		689,873		663,004
Accumulated amortization	577,482		577,482		554,934
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	226,323		226,323		222,923
Accumulated amortization	196,725		$ 196,725		$ 189,041
Minimum [Member]
Statement [Line Items]
Intangible asset life			3 years
Maximum [Member]
Statement [Line Items]
Intangible asset life			7 years
Maximum [Member] | Patents [Member]
Statement [Line Items]
Intangible asset life			10 years
Cost of net revenues [Member] | Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Amortization expense	11,500	$ 12,400	$ 22,500	$ 25,500
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 4,000	$ 3,700	$ 7,700	$ 7,300