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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of 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