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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | . Property, Plant and Equipment, net Property, plant and equipment consists of:
|  | Estimated Useful |  | December 31, |
|  | Lives |  | 2021 |  |  | 2020 |
|  |  |  | (In thousands) |
Land improvements |  | 10-25 years |  | $ | 7,374 |  |  | $ | 7,379 |
Buildings |  | 15-40 years |  |  | 206,037 |  |  |  | 206,732 |
Machinery, equipment and other |  | 3-10 years |  |  | 398,995 |  |  |  | 390,803 |
|  |  |  |  | 612,406 |  |  |  | 604,914 |
Less accumulated depreciation |  |  |  |  | (419,834 | ) |  |  | (399,095 | )
|  |  |  |  | 192,572 |  |  |  | 205,819 |
Land |  |  |  |  | 12,261 |  |  |  | 12,408 |
Construction work in process |  |  |  |  | 11,367 |  |  |  | 16,596 |
Total property, plant and equipment |  |  |  | $ | 216,200 |  |  | $ | 234,823 |
Depreciation expense totaled $27.2 million, $28.7 million and $31.0 million for 2021, 2020 and 2019, 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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