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Inventories
3 Months Ended
Mar. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
4 Inventories
Inventories are classified as follows (in thousands):
 
 
 
March 30, 2019
 
 
December 31, 2018
 
Raw materials
 
$
119,101
 
 
$
111,641
 
Work in progress
 
 
18,314
 
 
 
15,552
 
Finished goods
 
 
195,893
 
 
 
164,376
 
Total inventories
 
$
333,308
 
 
$
291,569