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Property, Plant and Equipment, net | 6 Months Ended
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Jun. 30, 2024
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| June 30, 2024 |  | December 31, 2023
Machinery, equipment and tooling | $ | 42,434 |  |  | $ | 40,632 |
SmartSystems | 31,127 |  |  | 30,651 |
Vehicles | 4,225 |  |  | 4,082 |
Furniture and fixtures | 1,479 |  |  | 1,466 |
Plant and building | 216,460 |  |  | 213,756 |
Real estate properties | 7,209 |  |  | 7,209 |
Railroad and sidings | 35,719 |  |  | 35,491 |
Land and land improvements | 40,528 |  |  | 40,519 |
Asset retirement obligations | 22,910 |  |  | 22,910 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 3,906 |  |  | 3,802 |
Construction in progress | 6,121 |  |  | 6,270 |
| 419,560 |  |  | 414,230 |
Less: accumulated depreciation and depletion | 173,030 |  |  | 159,138 |
Total property, plant and equipment, net | $ | 246,530 |  |  | $ | 255,092 |
Depreciation expense was $6,997 and $6,543 for the three months ended June 30, 2024 and 2023, respectively, and $13,978 and $12,885 for the six months ended June 30, 2024 and 2023, respectively

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