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
Jun. 30, 2018
Dec. 31, 2017
Jun. 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 (24,554) (23,064) (21,574)
Intangible assets subject to amortization, Net carrying amount 12,644 14,134 15,624
Intangible assets not subject to amortization 115,421 115,421 115,421
Intangible assets, net 128,065 129,555 131,045
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 (11,316) (10,651) (9,986)
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 $ (13,238) $ (12,413) $ (11,588)