Annual report pursuant to Section 13 and 15(d)

Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details)

v3.8.0.1
Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount $ 37,198 $ 37,198
Accumulated amortization (23,064) (19,181)
Net carrying amount 14,134 18,017
Intangible assets not subject to amortization 115,421 115,421
Intangible assets, net 129,555 133,438
Patents And Purchased Technology [Member]    
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount 14,198 14,198
Accumulated amortization (10,651) (9,321)
Customer Relationships [Member]    
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount 23,000 23,000
Accumulated amortization $ (12,413) $ (9,860)