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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 (in thousands):
 
 
  
December 31,
 
 
  
2020
 
 
2019
 
Land and land improvements
  
$
36,884
 
 
$
37,040
 
Buildings and leasehold improvements
  
 
376,705
 
 
 
355,425
 
Production and other equipment
  
 
588,625
 
 
 
537,211
 
Construction in progress
  
 
125,925
 
 
 
57,985
 
    
 
 
   
 
 
 
Total property, plant and equipment
  
 
1,128,139
 
 
 
987,661
 
Less: accumulated depreciation and amortization
  
 
(634,136
 
 
(570,319
    
 
 
   
 
 
 
Property, plant and equipment, net
  
$
494,003
 
 
$
417,342