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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment
G.    PROPERTY, PLANT AND EQUIPMENT
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
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Depreciation of property, plant and equipment for the years ended December 31, 2019, 2018, and 2017 was $70.8 million, $67.4 million, and $66.1 million, respectively. As of December 31, 2019 and 2018, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $5.4 million and $5.5 million, respectively. As of December 31, 2019 and 2018, the accumulated depreciation on these test systems was $5.1 million and $5.2 million, respectively.