Intangible Assets, Net and Goodwill (Schedule of Identifiable Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	$ 37,198	$ 37,198
Accumulated amortization	(33,211)	(31,561)
Net carrying amount	3,987	5,637
Intangible assets not subject to amortization	97,921	97,921
Intangible Assets, Net (Excluding Goodwill), Total	101,908	103,558
Patents And Purchased Technology [Member]
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	14,198	14,198
Accumulated amortization	(14,198)	(14,198)
Customer Relationships [Member]
Summary of Identifiable Intangible Assets [Line Items]
Gross carrying amount	23,000	23,000
Accumulated amortization	$ (19,013)	$ (17,363)