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Property, Plant and Equipment | 12 Months Ended
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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.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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