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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2021
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | 4. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment is classified as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | June 30, |  | December 31,
​ | ​ | Useful lives | ​ | 2021 | ​ | 2020
Land | ​ | ​ | ​ | $ | 991 | ​ | $ | 999
Building and improvements |  | 5 - 39 years | ​ |  | 14,171 | ​ |  | 14,169
Machinery, equipment, tools and dies |  | 3 - 15 years | ​ |  | 80,511 | ​ |  | 79,738
Construction work in progress | ​ | ​ | ​ | ​ | 8,107 | ​ | ​ | 6,821
Furniture, fixtures and other |  | 3 - 10 years | ​ |  | 19,178 | ​ |  | 16,313
​ | ​ | ​ | ​ |  | 122,958 | ​ |  | 118,040
Less accumulated depreciation | ​ | ​ | ​ |  | (67,805) | ​ |  | (62,612)
Property, plant and equipment, net | ​ | ​ | ​ | $ | 55,153 | ​ | $ | 55,428
​ Depreciation expense was approximately $2,948 and $2,394 for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, depreciation expense was $5,867 and $4,703, 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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