Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Intangible Assets, Net (Summary Of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Summary of Identifiable Intangible Assets [Line Items]          
Intangible assets subject to amortization, Gross carrying amount $ 37,198 $ 37,198 $ 37,198 $ 37,198 $ 37,198
Intangible assets subject to amortization, Accumulated amortization (30,514) (27,534) (30,514) (27,534) (29,024)
Intangible assets subject to amortization, Net carrying amount 6,684 9,664 6,684 9,664 8,174
Intangible assets not subject to amortization 115,421 115,421 115,421 115,421 115,421
Intangible assets, net 122,105 125,085 122,105 125,085 123,595
Amortization of Intangible Assets 700 700 1,500 1,500  
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 14,198 14,198
Intangible assets subject to amortization, Accumulated amortization (13,976) (12,646) (13,976) (12,646) (13,311)
Customer Relationships [Member]          
Summary of Identifiable Intangible Assets [Line Items]          
Intangible assets subject to amortization, Gross carrying amount 23,000 23,000 23,000 23,000 23,000
Intangible assets subject to amortization, Accumulated amortization $ (16,538) $ (14,888) $ (16,538) $ (14,888) $ (15,713)