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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
7.
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consist of the following as of December 31 (in thousands):
 
    
2023
     
2022
  
Machinery and equipment
    $ 545,037      $ 529,975  
Building and improvements
      145,821        120,116  
Forklifts and tractors
      24,646        24,516  
Computer equipment
      18,497        16,182  
Furniture and fixtures
      9,489        6,180  
Construction in process
      247,659        161,035  
Land
      29,143        24,886  
  
 
 
     
 
 
  
Total property, plant and equipment
      1,020,292        882,890  
Accumulated depreciation
      (310,890 )       (292,998 ) 
  
 
 
     
 
 
  
Total property, plant and equipment, net
    $ 709,402      $ 589,892  
  
 
 
     
 
 
  
The Company had construction in process as of December 31, 2023, of approximately $248 million. The Company expects that substantially all of the above noted construction in process will be completed and put into service during or before the year ending December 31, 2026.
 
Depreciation expense for the years ended December 31, 2023, 2022, and 2021, was $49.8 million, $43.9 million, and $35.5 million, respectively.