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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consist of the following:
|  |  | December 31,
| Useful Life |  | 2021 |  | 2020
| (Years) |  |  |  |
Land |  |  | $ | 2,762 |  |  | $ | 2,724 |
Building and improvements | 30-40 |  | 24,787 |  |  | 25,731 |
Office furniture and equipment | 5-8 |  | 16,620 |  |  | 16,980 |
Machinery and equipment | 5-7 |  | 250,166 |  |  | 237,253 |
|  |  | 294,335 |  |  | 282,688 |
Accumulated depreciation and amortization |  |  | (207,757) |  |  | (190,007) |
Property, plant and equipment, net |  |  | $ | 86,578 |  |  | $ | 92,681 |
Depreciation expense was approximately $25.2 million, $24.7 million, and $24.2 million for the years ended December 31, 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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