Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 930,740	$ 922,146
Accumulated Amortization	$ 849,249	$ 813,668
Weighted-Average Life (Years)	6 years 1 month 2 days	6 years 29 days
Finite-Lived Intangible Assets, Net	$ 81,491
Product related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	742,949	$ 734,973
Accumulated Amortization	$ 665,798	$ 633,633
Weighted-Average Life (Years)	6 years 21 days	6 years 14 days
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 187,791	$ 187,173
Accumulated Amortization	$ 183,451	$ 180,035
Weighted-Average Life (Years)	6 years 2 months 19 days	6 years 2 months 23 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	$ 32,800	$ 51,300
Operating expenses | Other
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 2,800	$ 15,900