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
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Summary of Identifiable Intangible Assets [Line Items]      
Gross carrying amount $ 37,198 $ 37,198 $ 37,198
Accumulated amortization (32,386) (31,561) (30,514)
Net carrying amount 4,812 5,637 6,684
Intangible assets not subject to amortization 97,921 97,921 115,421
Intangible Assets, Net (Excluding Goodwill), Total 102,733 103,558 122,105
Patents And Purchased Technology [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Gross carrying amount 14,198 14,198 14,198
Accumulated amortization (14,198) (14,198) (13,976)
Customer Relationships [Member]      
Summary of Identifiable Intangible Assets [Line Items]      
Gross carrying amount 23,000 23,000 23,000
Accumulated amortization $ (18,188) $ (17,363) $ (16,538)