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v3.21.1

Property, plant and equipment (Tables) | 3 Months Ended
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Mar. 31, 2021
Property, plant and equipment |
Summary of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​ | ​ | ​
Land | ​ | $ | 2,378 | ​ | $ | 2,378
Land improvements | ​ | ​ | 4,830 | ​ | ​ | 4,830
Leasehold improvements | ​ | ​ | 4,087 | ​ | ​ | 4,087
Buildings | ​ | ​ | 29,584 | ​ | ​ | 29,580
Machinery and equipment | ​ | ​ | 61,459 | ​ | ​ | 61,154
Furniture and fixtures | ​ | ​ | 20,144 | ​ | ​ | 19,782
Mobile equipment and other | ​ | ​ | 5,208 | ​ | ​ | 5,200
Construction-in-process | ​ | ​ | 12,863 | ​ | ​ | 11,751
Total property, plant and equipment | ​ | ​ | 140,553 | ​ | ​ | 138,762
Less accumulated depreciation | ​ | ​ | (76,151) | ​ | ​ | (74,442)
Net property, plant and equipment | ​ | $ | 64,402 | ​ | $ | 64,320

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