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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
6.
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consist of the following as of December 31 (in thousands):
 
    
2020
     
2019
  
Machinery and equipment
    $ 312,870      $ 248,633  
Building and improvements
      61,860        51,547  
Forklifts and tractors
      16,003        10,870  
Computer equipment
      11,948        10,647  
Furniture and fixtures
      1,534        1,441  
Construction in process
      157,465        59,257  
Land
      11,351        11,417  
    
 
 
     
 
 
  
Total property, plant and equipment
      573,031        393,812  
Accumulated depreciation
      (236,494 )       (222,512 ) 
    
 
 
     
 
 
  
Total property, plant and equipment, net
    $ 336,537      $ 171,300  
    
 
 
     
 
 
  
The Company had construction in process as of December 31, 2020 of approximately $157.5 million. The Company expects that the construction in process will be completed and put into service in the year ending December 31, 2021.
Depreciation expense for the years ended December 31, 2020, 2019, and 2018, totaled $17.5 million, $13.6 million, and $13.4 million, respectively.