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Property, plant and equipment (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Property, plant and equipment |
Summary of property, plant and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
​ | ​ | ​ | ​ | ​
Land | ​ | $ | 3,969 | ​ | $ | 2,378
Land improvements | ​ | 5,278 | ​ | 4,830
Leasehold improvements | ​ | ​ | 5,405 | ​ | ​ | 4,087
Buildings | ​ | 34,635 | ​ | 29,580
Machinery and equipment | ​ | 68,939 | ​ | 61,154
Furniture and fixtures | ​ | 22,275 | ​ | 19,782
Mobile equipment and other | ​ | 4,737 | ​ | 5,200
Construction-in-process | ​ | 4,235 | ​ | 11,751
Total property, plant and equipment | ​ | 149,473 | ​ | 138,762
Less accumulated depreciation | ​ | (82,686) | ​ | (74,442)
Net property, plant and equipment | ​ | $ | 66,787 | ​ | $ | 64,320

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