Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Intangible Assets [Abstract]
Gross carrying amount	$ 1,139,557		$ 1,139,557		$ 1,111,296
Accumulated amortization	773,509		773,509		720,579
Intangible assets, fair value	366,048		366,048
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	683,695		683,695		618,336
Accumulated amortization	500,282		500,282		454,830
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	455,862		455,862		492,960
Accumulated amortization	273,227		$ 273,227		$ 265,749
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	20,100	$ 24,000	$ 57,600	$ 102,700
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	76,900	$ 10,000	97,400	$ 32,900
ByteMobile [Member] | Enterprise and Service Provider Division [Member]
Intangible Assets [Abstract]
Impairment of intangible assets			65,400
ByteMobile [Member] | Enterprise and Service Provider Division [Member] | Amortization of Product Related Intangibles [Member]
Intangible Assets [Abstract]
Impairment of intangible assets			1,000
ByteMobile [Member] | Enterprise and Service Provider Division [Member] | Amortization and Impairment of Other Intangible Assets [Member]
Intangible Assets [Abstract]
Impairment of intangible assets			64,400
ByteMobile [Member] | Estimate of Fair Value Measurement [Member] | Enterprise and Service Provider Division [Member]
Intangible Assets [Abstract]
Intangible assets, fair value	$ 27,600		$ 27,600