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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
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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)

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