Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net (Summary Of Identifiable Intangible Assets) (Details)

v3.20.1
Intangible Assets, Net (Summary Of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Summary of Identifiable Intangible Assets [Line Items]      
Intangible assets subject to amortization, Gross carrying amount $ 37,198 $ 37,198 $ 37,198
Intangible assets subject to amortization, Accumulated amortization (29,769) (29,024) (26,789)
Intangible assets subject to amortization, Net carrying amount 7,429 8,174 10,409
Intangible assets not subject to amortization 115,421 115,421 115,421
Intangible assets, net 122,850 123,595 125,830
Patents And Purchased Technology [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Intangible assets subject to amortization, Gross carrying amount 14,198 14,198 14,198
Intangible assets subject to amortization, Accumulated amortization (13,644) (13,311) (12,314)
Customer Relationships [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Intangible assets subject to amortization, Gross carrying amount 23,000 23,000 23,000
Intangible assets subject to amortization, Accumulated amortization $ (16,125) $ (15,713) $ (14,475)