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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Intangible Assets [Abstract]
Gross carrying amount	$ 914,564		$ 885,927
Accumulated amortization	758,669		743,975
Intangible assets, fair value	155,895
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	688,241		663,004
Accumulated amortization	565,963		554,934
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	226,323		222,923
Accumulated amortization	$ 192,706		$ 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	$ 11,000	$ 13,100
Operating Expense [Member] \| Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 3,600	$ 3,600