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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consist of the following at December 31:
| 2020 |  | 2019
Land | $ | 4,027 |  |  | $ | 4,686 |
Building and improvements | 93,886 |  |  | 95,632 |
Machinery and equipment | 243,810 |  |  | 233,140 |
Construction in progress | 15,680 |  |  | 13,318 |
| 357,403 |  |  | 346,776 |
Less: Accumulated depreciation | (245,996) |  |  | (227,893) |
| $ | 111,407 |  |  | $ | 118,883 |
Internal-use software, included in gross machinery and equipment at December 31, 2020 and 2019 was $50.3 million and $49.6 million, respectively, with related accumulated depreciation of $42.9 million and $38.7 million, respectively. Internal use software depreciation expense was $4.7 million, $4.8 million and $4.7 million for the years ended December 31, 2020, 2019 and 2018, 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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