Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Summary of Identifiable Intangible Assets [Line Items]          
Gross carrying amount $ 37,198 $ 37,198 $ 37,198 $ 37,198 $ 37,198
Accumulated amortization (34,036) (32,386) (34,036) (32,386) (33,211)
Net carrying amount 3,162 4,812 3,162 4,812 3,987
Intangible assets not subject to amortization 97,921 97,921 97,921 97,921 97,921
Intangible Assets, Net (Excluding Goodwill), Total 101,083 102,733 101,083 102,733 101,908
Amortization of Intangible Assets 400 400 800 800  
Patents And Purchased Technology [Member]          
Summary of Identifiable Intangible Assets [Line Items]          
Gross carrying amount 14,198 14,198 14,198 14,198 14,198
Accumulated amortization (14,198) (14,198) (14,198) (14,198) (14,198)
Customer Relationships [Member]          
Summary of Identifiable Intangible Assets [Line Items]          
Gross carrying amount 23,000 23,000 23,000 23,000 23,000
Accumulated amortization $ (19,838) $ (18,188) $ (19,838) $ (18,188) $ (19,013)