Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 922,146	$ 974,074
Accumulated Amortization	$ 813,668	$ 806,887
Weighted-Average Life (Years)	6 years 29 days	6 years 1 month 20 days
Finite-Lived Intangible Assets, Net	$ 108,478
Product related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	734,973	$ 746,152
Accumulated Amortization	$ 633,633	$ 601,993
Weighted-Average Life (Years)	6 years 14 days	6 years 21 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 187,173	$ 227,922
Accumulated Amortization	$ 180,035	$ 204,894
Weighted-Average Life (Years)	6 years 2 months 23 days	6 years 4 months 24 days
Primarily Cedexis Developed Technology
Finite-Lived Intangible Assets [Line Items]
Non-cash impairment charges	$ 13,200
Finite-Lived Intangible Assets, Net	$ 4,100
Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	3 years
Minimum | Patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	7 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	7 years
Maximum | Patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life (Years)	10 years
Cost of net revenues | Product related intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 51,300	$ 47,100
Operating expenses | Other
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 15,900	$ 15,900