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, 2017
Dec. 31, 2016
Jun. 30, 2016
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 (21,574) (19,181) (16,608)
Intangible assets subject to amortization, Net carrying amount 15,624 18,017 20,590
Intangible assets not subject to amortization 115,421 115,421 115,421
Intangible assets, net 131,045 133,438 136,011
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 (9,986) (9,321) (8,656)
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 $ (11,588) $ (9,860) $ (7,952)