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Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments [Abstract]  
Investments schedule [Table Text Block]
As of December 31,
(in thousands)20212020
Rabbi trust (associated with the Non-Qualified Deferred Compensation Plan)$12,069 $10,755 
Investments in equity securities26 21 
Total$12,095 $10,776