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Intangible Assets, Net and Goodwill (Summary Of Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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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 | (22,319) | (19,181) | (17,895)
Intangible assets subject to amortization, Net carrying amount | 14,879 | 18,017 | 19,303
Intangible assets not subject to amortization | 115,421 | 115,421 | 115,421
Intangible assets, net | 130,300 | 133,438 | 134,724
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 | (10,319) | (9,321) | (8,989)
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 | $ (12,000) | $ (9,860) | $ (8,906)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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