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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property Plant and Equipment, Net
Property, plant and equipment, net consisted of the following at December 31, 2019 and 2018:
                 
 
2019
 
  
2018
 
 
(in thousands)
 
Land
  $
16,561
    $
16,561
 
Buildings
   
107,282
     
105,935
 
Machinery
,
equipment
 and 
s
oftware
    
834,970
     
752,722
 
Furniture and fixtures
    
29,157
     
27,432
 
Leasehold improvements
   
59,378
     
52,536
 
Construction in progress
   
2,537
     
6,276
 
                 
   
1,049,885
     
961,462
 
Less: accumulated depreciation
   
729,669
     
681,641
 
                 
  $
320,216
    $
279,821