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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment
G.    PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, net consisted of the following at December 31, 2020 and 2019:
 
 
  
2020
 
  
2019
 
 
  
(in thousands)
 
Land
  
$
17,207
 
  
$
16,561
 
Buildings
  
 
108,221
 
  
 
107,282
 
Machinery, equipment and software
  
 
956,035
 
  
 
834,970
 
Furniture and fixtures
  
 
28,487
 
  
 
29,157
 
Leasehold improvements
  
 
61,276
 
  
 
59,378
 
Construction in progress
  
 
13,098
 
  
 
2,537
 
    
 
 
     
 
 
  
 
  
 
1,184,324
 
  
 
1,049,885
 
Less: accumulated depreciation
  
 
789,524
 
  
 
729,669
 
    
 
 
     
 
 
  
 
  
$
394,800
 
  
$
320,216
 
    
 
 
     
 
 
  
Depreciation of property, plant and equipment for the years ended December 31, 2020, 2019, and 2018 was $80.1 million, $70.8 million, and $67.4 million, respectively. As of December 31, 2020 and 2019, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $23.4 million and $5.4 million, respectively. As of December 31, 2020 and 2019, the accumulated depreciation on these test systems was $7.5 million and $5.1 million, respectively.