Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Intangible Assets [Abstract]
Gross carrying amount	$ 918,197		$ 918,197		$ 885,927
Accumulated amortization	789,900		789,900		743,975
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	691,874		691,874		663,004
Accumulated amortization	589,111		589,111		554,934
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	226,323		226,323		222,923
Accumulated amortization	200,789		$ 200,789		$ 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	11,600	$ 17,600	$ 34,200	$ 43,100
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 4,100	$ 3,700	$ 11,700	$ 11,100