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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 at December 31:
| 2021 |  | 2020
Land | $ | 4,027 |  |  | $ | 4,027 |
Building and improvements | 95,518 |  |  | 93,886 |
Machinery and equipment | 256,478 |  |  | 243,810 |
Construction in progress | 16,601 |  |  | 15,680 |
| 372,624 |  |  | 357,403 |
Less: Accumulated depreciation | (263,761) |  |  | (245,996) |
| $ | 108,863 |  |  | $ | 111,407 |
Internal-use software, included in gross machinery and equipment at December 31, 2021 and 2020 was $49.1 million and $50.3 million, respectively, with related accumulated depreciation of $45.3 million and $42.9 million, respectively. Internal use software depreciation expense was $3.3 million, $4.7 million and $4.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. Also, during 2020, we sold a vacant facility for $3.2 million.

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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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