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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment
G.
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, net consisted of the following at December 31, 2022 and 2021:
 
    
2022
    
2021
 
    
(in thousands)
 
Land
   $ 18,481      $ 17,207  
Buildings
     128,991        126,468  
Machinery, equipment and software
     1,059,880        994,828  
Furniture and fixtures
     29,929        28,743  
Leasehold improvements
     64,631        64,110  
Construction in progress
     22,470        8,105  
    
 
 
    
 
 
 
       1,324,382        1,239,461  
Less: accumulated depreciation
     905,699        852,221  
    
 
 
    
 
 
 
     $ 418,683      $ 387,240  
    
 
 
    
 
 
 
Depreciation of property, plant and equipment for the years ended December 31, 2022, 2021, and 2020 was $90.8 million, $91.1 million, and $80.1 million, respectively. As of December 31, 2022 and 2021, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $5.8 million and $13.4 million, respectively. As of December 31, 2022 and 2021, the accumulated depreciation on these test systems was $5.6 million and $8.7 million, respectively.