Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Intangible Assets [Abstract]
Gross carrying amount	$ 975,810		$ 974,074
Accumulated amortization	820,719		806,887
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	747,888		746,152
Accumulated amortization	612,295		601,993
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	227,922		227,922
Accumulated amortization	$ 208,424		$ 204,894
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	$ 10,300	$ 11,000
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 3,500	$ 3,600