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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
G.
PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment, net consisted of the following at December 31, 2023 and 2022:

 

 

 

2023 (1)

 

 

2022

 

 

 

(in thousands)

 

Land

 

$

19,487

 

 

$

18,481

 

Buildings

 

 

127,705

 

 

 

128,991

 

Machinery, equipment and software

 

 

1,047,235

 

 

 

1,059,880

 

Furniture and fixtures

 

 

28,093

 

 

 

29,929

 

Leasehold improvements

 

 

66,777

 

 

 

64,631

 

Construction in progress

 

 

54,799

 

 

 

22,470

 

 

 

1,344,096

 

 

 

1,324,382

 

Less: accumulated depreciation

 

 

898,604

 

 

 

905,699

 

 

$

445,492

 

 

$

418,683

 

 

(1)
Excludes $9.0 million of property, plant and equipment, net classified as assets held for sale. See Note E: “Assets held for sale” for additional information.

 

Depreciation of property, plant and equipment for the years ended December 31, 2023, 2022, and 2021 was $92.1 million, $90.8 million, and $91.1 million, respectively. As of December 31, 2023 and 2022, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $5.1 million and $5.8 million, respectively. As of December 31, 2023 and 2022, the accumulated depreciation on these test systems was $4.9 million and $5.6 million, respectively.