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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
6. Property, Plant and Equipment

   
December 31,
  
 
  
2023
    
2022
  
 
  
(In thousands)
  
Land, buildings and improvements
  
$
45,710
    
$
42,651
  
Machinery and equipment
    
177,337
      
166,149
  
Tools, dies and auxiliary equipment
    
73,494
      
67,017
  
Furniture and fixtures
    
33,212
      
32,084
  
Leasehold improvements
    
16,418
      
15,083
  
Construction-in-progress
    
35,357
      
23,340
  
Total property, plant and equipment
    
381,528
      
346,324
  
Less accumulated depreciation
    
259,656
      
239,176
  
Total property, plant and equipment, net
  
$
121,872
    
$
107,148
  

Depreciation expense was $19.7 million in 2023, $19 million in 2022 and $18.2 million in 2021.