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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment | G. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, net consisted of the following at December 31, 2021 and 2020:
|  | 2021 |  |  | 2020 |
|  | (in thousands) |
Land |  | $ | 17,207 |  |  | $ | 17,207 |
Buildings |  |  | 126,468 |  |  |  | 108,221 |
Machinery, equipment and software |  |  | 994,828 |  |  |  | 956,035 |
Furniture and fixtures |  |  | 28,743 |  |  |  | 28,487 |
Leasehold improvements |  |  | 64,110 |  |  |  | 61,276 |
Construction in progress |  |  | 8,105 |  |  |  | 13,098 |
|  |  | 1,239,461 |  |  |  | 1,184,324 |
Less: accumulated depreciation |  |  | 852,221 |  |  |  | 789,524 |
|  | $ | 387,240 |  |  | $ | 394,800 |
Depreciation of property, plant and equipment for the years ended December 31, 2021, 2020, and 2019 was $91.1 million, $80.1 million, and $70.8 million, respectively. As of December 31, 2021 and 2020, the gross book value included in machinery and equipment for internally manufactured test systems being leased by customers was $13.4 million and $23.4 million, respectively. As of December 31, 2021 and 2020, the accumulated depreciation on these test systems was $8.7 million and $7.5 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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