The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Intangible Assets [Abstract]
Gross carrying amount	$ 927,766		$ 927,766		$ 922,146
Accumulated amortization	840,642		840,642		813,668
Non-cash impairment of intangible assets		$ 13,200
Fair value of definite-lived intangible assets	87,124	4,100	87,124	$ 4,100
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	740,593		740,593		734,973
Accumulated amortization	658,509		658,509		633,633
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	187,173		187,173		187,173
Accumulated amortization	182,133		$ 182,133		$ 180,035
Minimum [Member]
Statement [Line Items]
Intangible asset life			3 years
Minimum [Member] \| Patents [Member]
Statement [Line Items]
Intangible asset life			7 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	8,300	22,600	$ 24,900	42,700
Operating Expense [Member] \| Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 700	$ 4,900	$ 2,100	$ 11,700