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Property, Plant and Equipment, net
 6 Months Ended
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, 2024December 31, 2023
Machinery, equipment and tooling$42,434 $40,632 
SmartSystems
31,127 30,651 
Vehicles4,225 4,082 
Furniture and fixtures1,479 1,466 
Plant and building216,460 213,756 
Real estate properties7,209 7,209 
Railroad and sidings35,719 35,491 
Land and land improvements40,528 40,519 
Asset retirement obligations22,910 22,910 
Mineral properties7,442 7,442 
Deferred mining costs3,906 3,802 
Construction in progress6,121 6,270 
419,560 414,230 
Less: accumulated depreciation and depletion173,030 159,138 
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