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Property, Plant and Equipment, net

3 Months Ended

Mar. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, net

Property, Plant and Equipment, net

Net property, plant and equipment consisted of:

			March 31, 2021						December 31, 2020
Machinery, equipment and tooling			$	29,089					$	29,002
SmartSystems			24,067						22,352
Vehicles			2,899						2,893
Furniture and fixtures			1,325						1,302
Plant and building			199,923						199,867
Real estate properties			6,462						6,458
Railroad and sidings			27,703						27,703
Land and land improvements			33,155						33,040
Asset retirement obligation			20,730						19,993
Mineral properties			7,442						7,442
Deferred mining costs			2,425						2,123
Construction in progress			8,301						7,489
			363,521						359,664
Less: accumulated depreciation and depletion			91,324						84,988
Total property, plant and equipment, net			$	272,197					$	274,676

Depreciation expense was $6,177 and $5,276 for the three months ended March 31, 2021 and 2020, respectively.

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- References

No definition available.

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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

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