Annual report pursuant to Section 13 and 15(d)

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

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Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount $ 37,198 $ 37,198
Accumulated amortization (31,561) (29,024)
Net carrying amount 5,637 8,174
Intangible assets not subject to amortization 97,921 115,421
Intangible Assets, Net (Excluding Goodwill), Total 103,558 123,595
Patents And Purchased Technology [Member]    
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount 14,198 14,198
Accumulated amortization (14,198) (13,311)
Customer Relationships [Member]    
Summary of Identifiable Intangible Assets [Line Items]    
Gross carrying amount 23,000 23,000
Accumulated amortization $ (17,363) $ (15,713)