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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 were as follows (in thousands):
| 2021 |  | 2020
Land and improvements | $ | 42,195 |  |  | $ | 26,529 |
Buildings and improvements | 280,947 |  |  | 277,449 |
Manufacturing equipment | 384,617 |  |  | 340,838 |
Office, warehouse and automotive equipment | 61,994 |  |  | 54,211 |
Additions in progress | 105,520 |  |  | 39,354 |
Total property, plant and equipment | 875,273 |  |  | 738,381 |
Accumulated depreciation | (424,212) |  |  | (387,631) |
Net property, plant and equipment | $ | 451,061 |  |  | $ | 350,750 |
Depreciation expense was $40.0 million in 2021, $38.0 million in 2020 and $32.0 million in 2019.

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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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