Quarterly report pursuant to Section 13 or 15(d)

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

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Intangible Assets, Net and Goodwill (Summary Of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
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 (25,299) (23,064) (22,319)
Intangible assets subject to amortization, Net carrying amount 11,899 14,134 14,879
Intangible assets not subject to amortization 115,421 115,421 115,421
Intangible assets, net 127,320 129,555 130,300
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 (11,649) (10,651) (10,319)
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 $ (13,650) $ (12,413) $ (12,000)