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Acquisitions, Goodwill and Identified Intangible Assets - Identified Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization $ (482,379) $ (459,870)
Net 209,766  
Intangible assets, gross 692,145 692,145
Intangible assets, net 209,766 232,275
Acquired patents / core technology    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 151,184 151,184
Accumulated Amortization (137,086) (135,952)
Net $ 14,098 15,232
Acquired patents / core technology | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 3 years  
Acquired patents / core technology | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 15 years  
Existing technology    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 206,878 206,878
Accumulated Amortization (139,590) (130,890)
Net $ 67,288 75,988
Existing technology | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 5 years  
Existing technology | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 10 years  
Customer contracts and related relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 291,769 291,769
Accumulated Amortization (186,173) (174,741)
Net $ 105,596 117,028
Customer contracts and related relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 3 years  
Customer contracts and related relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 9 years  
Trademarks/trade name    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 40,083 40,083
Accumulated Amortization (17,299) (16,056)
Net $ 22,784 24,027
Trademarks/trade name | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 4 years  
Trademarks/trade name | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 10 years  
Non-competition agreements    
Finite-Lived Intangible Assets [Line Items]    
Average Life (Years) 1 year  
Finite-lived intangible assets, gross $ 2,231 2,231
Accumulated Amortization $ (2,231) (2,231)
Net   $ 0