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Property, Plant and Equipment, net | 6 Months Ended
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Jun. 30, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| June 30, 2022 |  | December 31, 2021
Machinery, equipment and tooling | $ | 32,993 |  |  | $ | 30,813 |
SmartSystems | 27,534 |  |  | 27,343 |
Vehicles | 3,199 |  |  | 3,066 |
Furniture and fixtures | 1,336 |  |  | 1,325 |
Plant and building | 200,129 |  |  | 199,958 |
Real estate properties | 6,507 |  |  | 6,496 |
Railroad and sidings | 33,622 |  |  | 27,703 |
Land and land improvements | 40,172 |  |  | 35,652 |
Asset retirement obligation | 28,818 |  |  | 20,536 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 2,455 |  |  | 2,455 |
Construction in progress | 9,064 |  |  | 9,574 |
| 393,271 |  |  | 372,363 |
Less: accumulated depreciation and depletion | 122,678 |  |  | 109,898 |
Total property, plant and equipment, net | $ | 270,593 |  |  | $ | 262,465 |
Depreciation expense was $6,449 and $6,037 for the three months ended June 30, 2022 and 2021, respectively, and $12,810 and $12,213 for the six months ended June 30, 2022 and 2021, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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