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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
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 (26,789) (26,044) (23,809)
Intangible assets subject to amortization, Net carrying amount 10,409 11,154 13,389
Intangible assets not subject to amortization 115,421 115,421 115,421
Intangible assets, net 125,830 126,575 128,810
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 (12,314) (11,981) (10,984)
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 $ (14,475) $ (14,063) $ (12,825)