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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Identifiable Intangible Assets [Line Items]      
Amortization expense $ 3,000 $ 3,000 $ 3,900
Gross carrying amount 37,198 37,198  
Accumulated amortization (29,024) (26,044)  
Net carrying amount 8,174 11,154  
Intangible assets not subject to amortization 115,421 115,421  
Intangible assets, net 123,595 126,575  
Estimated amortization expense, 2018 2,537    
Estimated amortization expense, 2019 1,650    
Estimated amortization expense, 2020 1,650    
Estimated amortization expense, 2021 1,650    
Estimated amortization expense, 2022 688    
Patents And Purchased Technology [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Gross carrying amount 14,198 14,198  
Accumulated amortization (13,311) (11,981)  
Customer Relationships [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Gross carrying amount 23,000 23,000  
Accumulated amortization $ (15,713) $ (14,063)