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Intangible Assets, Goodwill and Other (Tables)
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule Of Identifiable Intangible Assets [Table Text Block]
December 31,
(in thousands)
20212020
Intangible assets with definite lives:
Patents and purchased technology$14,198 $14,198 
Customer relationships23,000 23,000 
Gross carrying amount37,198 37,198 
Accumulated amortization:
Patents and purchased technology(14,198)(14,198)
Customer relationships(19,013)(17,363)
Accumulated amortization(33,211)(31,561)
Net carrying amount3,987 5,637 
Intangible assets with indefinite lives97,921 97,921 
Intangible assets, net$101,908 $103,558 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table presents the estimated annual amortization expense for the years 2022 through 2026:

(in thousands)
2022$1,650 
20231,650 
2024688 
2025— 
2026—