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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consists of:
| December 31,
| 2023 |  | 2022
Machinery, equipment and tooling | $ | 40,632 |  |  | $ | 36,483 |
SmartSystems | 30,651 |  |  | 28,376 |
Vehicles | 4,082 |  |  | 3,835 |
Furniture and fixtures | 1,466 |  |  | 1,421 |
Plant and buildings | 213,756 |  |  | 200,480 |
Real estate properties | 7,209 |  |  | 6,155 |
Railroad and sidings | 35,491 |  |  | 33,698 |
Land and land improvements | 40,519 |  |  | 40,433 |
Asset retirement obligation | 22,910 |  |  | 22,583 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred stripping costs | 3,802 |  |  | 2,470 |
Construction in progress | 6,270 |  |  | 10,421 |
| 414,230 |  |  | 393,797 |
Less: accumulated depreciation and depletion | 159,138 |  |  | 134,954 |
Total property, plant and equipment, net | $ | 255,092 |  |  | $ | 258,843 |
Depreciation expense was $26,533, $25,693 and $24,667 for the years ended December 31, 2023, 2022 and 2021, respectively. Depletion expense was $35, $36 and $36 for the years ended December 31, 2023, 2022 and 2021, respectively. The Company capitalized no interest expense associated with the construction of new property, plant and equipment for the years ended December 31, 2023, 2022 and 2021.

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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