Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,052,873	$ 1,037,663
Accumulated Amortization	$ 824,880	$ 754,245
Weighted-Average Life (Years)	6 years 1 month 8 days	6 years 3 months 7 days
Finite-Lived Intangible Assets, Net	$ 227,993
Product related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	602,060	$ 589,847
Accumulated Amortization	$ 509,706	$ 476,141
Weighted-Average Life (Years)	5 years 6 months 14 days	5 years 7 months 31 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 450,813	$ 447,816
Accumulated Amortization	$ 315,174	$ 278,104
Weighted-Average Life (Years)	6 years 10 months 12 days	6 years 5 months 22 days
Patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	10 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	7 years
Cost of net revenues | Product related intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 60,400	$ 131,200
Operating expenses | Other
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	29,200	$ 108,800
Enterprise and Service Provider | ByteMobile
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	123,000
Enterprise and Service Provider | Amortization and Impairment of Other Intangible Assets | ByteMobile
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	67,100
Enterprise and Service Provider | Amortization of Product Related Intangibles | ByteMobile
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	55,900
Estimate of Fair Value Measurement | Enterprise and Service Provider | ByteMobile
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 26,800