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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | NOTE 5: PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment are presented at cost, net of accumulated depreciation, and consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | Useful Lives |  | 2020 |  | 2019
(in thousands) | ​ | ​ | ​ |  | ​ | ​ |  | ​
Land |  | N/A | ​ | $ | 878 | ​ | $ | 878
Buildings |  | 7-40 | ​ |  | 20,966 | ​ |  | 20,552
Operating equipment and property |  | 3-15 | ​ |  | 12,923 | ​ |  | 11,891
Furniture and fixtures |  | 5-7 | ​ |  | 2,560 | ​ |  | 1,999
Vehicles |  | 5-10 | ​ |  | 7,677 | ​ |  | 7,734
Gross property, plant and equipment |  | ​ | ​ |  | 45,004 | ​ |  | 43,054
Less: accumulated depreciation |  | ​ | ​ |  | (30,066) | ​ |  | (28,258)
Net property, plant and equipment | ​ | ​ | ​ | $ | 14,938 | ​ | $ | 14,796
​ Depreciation expense was $1,954,000 in 2020, $2,090,000 in 2019 and $1,820,000 in 2018. The Company’s accounts payable for purchases of property and equipment was immaterial as of December 31, 2020, December 31, 2019 and December 31, 2018.

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