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Property, Plant and Equipment, net | 9 Months Ended
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Sep. 30, 2025
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| September 30, 2025 |  | December 31, 2024
Machinery, equipment and tooling | $ | 47,305 |  |  | $ | 43,041 |
SmartSystems | 32,583 |  |  | 32,551 |
Vehicles | 4,201 |  |  | 3,961 |
Furniture and fixtures | 1,420 |  |  | 1,368 |
Plant and building | 222,768 |  |  | 218,546 |
Real estate properties | 7,726 |  |  | 7,161 |
Railroad and sidings | 36,676 |  |  | 35,728 |
Land and land improvements | 40,627 |  |  | 40,627 |
Asset retirement obligations | 23,283 |  |  | 23,283 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 6,067 |  |  | 4,434 |
Construction in progress | 2,788 |  |  | 3,216 |
| 432,886 |  |  | 421,358 |
Less: accumulated depreciation and depletion | 205,248 |  |  | 184,666 |
Total property, plant and equipment, net | $ | 227,638 |  |  | $ | 236,692 |
Depreciation expense was $6,971 and $6,946 for the three months ended September 30, 2025 and 2024, respectively, and $20,995 and $20,924 for the nine months ended September 30, 2025 and 2024, respectively.

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