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Inventories
 9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are stated at the lower of cost or net realizable value. Finished goods and work-in-process inventories include material, labor, and manufacturing overhead costs.
(amounts in thousands)September 26, 2020December 31, 2019
Raw materials
$372,456 $372,289 
Work in process
36,359 38,432 
Finished goods
101,134 94,357 
Total inventories$509,949 $505,078