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Property, Plant and Equipment | 12 Months Ended
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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.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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