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Acquisitions Acquisitions (Purchase Price Breakdown) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 03, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2018
Business Acquisition [Line Items]          
Goodwill   $ 392,978 $ 398,292 $ 391,972 $ 398,292
Lafayette, California [Member]          
Business Acquisition [Line Items]          
Payments to acquire businesses   28,000 $ 5,000    
Consideration transferred $ 33,000        
Goodwill 12,916     13,416  
Property, plant & equipment $ 1,720 $ 1,700   $ 1,720