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v3.20.2

Property, plant and equipment (Tables) | 6 Months Ended
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Jun. 30, 2020
Property, plant and equipment |
Summary of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ | ​ | 2020 | ​ | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​
Land | ​ | $ | 2,378 | ​ | $ | 2,378
Land improvements | ​ | ​ | 4,574 | ​ | ​ | 4,541
Leasehold improvements | ​ | ​ | 4,087 | ​ | ​ | 4,087
Buildings | ​ | ​ | 29,168 | ​ | ​ | 28,715
Machinery and equipment | ​ | ​ | 58,051 | ​ | ​ | 55,238
Furniture and fixtures | ​ | ​ | 18,605 | ​ | ​ | 17,918
Mobile equipment and other | ​ | ​ | 5,249 | ​ | ​ | 5,285
Construction-in-process | ​ | ​ | 7,190 | ​ | ​ | 6,555
Total property, plant and equipment | ​ | ​ | 129,302 | ​ | ​ | 124,717
Less accumulated depreciation | ​ | ​ | (70,188) | ​ | ​ | (66,273)
Net property, plant and equipment | ​ | $ | 59,114 | ​ | $ | 58,444

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