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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
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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 | (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)

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