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Property, Plant and Equipment, net
 9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net
Net property, plant and equipment consisted of:
September 30, 2023December 31, 2022
Machinery, equipment and tooling$40,114 $36,483 
SmartSystems
30,229 28,376 
Vehicles4,066 3,835 
Furniture and fixtures1,452 1,421 
Plant and building208,685 200,480 
Real estate properties6,184 6,155 
Railroad and sidings33,765 33,698 
Land and land improvements40,506 40,433 
Asset retirement obligations22,583 22,583 
Mineral properties7,442 7,442 
Deferred mining costs3,802 2,470 
Construction in progress9,108 10,421 
407,936 393,797 
Less: accumulated depreciation and depletion152,292 134,954 
Total property, plant and equipment, net$255,644 $258,843 
Depreciation expense was $6,776 and $6,498 for the three months ended September 30, 2023 and 2022, respectively, and $19,661 and $19,309 for the nine months ended September 30, 2023 and 2022, respectively.