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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)

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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