XML 27 R12.htm IDEA: XBRL DOCUMENT
v3.20.2

Property, Plant and Equipment, net | 6 Months Ended
--- | ---
Jun. 30, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, net | Property, Plant and Equipment, net Net property, plant and equipment consisted of:
| June 30, 2020 |  | December 31, 2019
Machinery, equipment and tooling | $ | 20,145 |  |  | $ | 19,683 |
SmartSystems | 20,538 |  |  | 15,811 |
Vehicles | 2,708 |  |  | 2,419 |
Furniture and fixtures | 1,214 |  |  | 1,228 |
Plant and building | 170,401 |  |  | 170,283 |
Real estate properties | 4,678 |  |  | 4,946 |
Railroad and sidings | 27,703 |  |  | 27,701 |
Land and land improvements | 21,337 |  |  | 21,320 |
Asset retirement obligation | 11,480 |  |  | 11,480 |
Mineral properties | 7,442 |  |  | 7,442 |
Deferred mining costs | 2,104 |  |  | 2,004 |
Construction in progress | 9,012 |  |  | 9,208 |
| 298,762 |  |  | 293,525 |
Less: accumulated depreciation and depletion | 73,597 |  |  | 63,064 |
Total property, plant and equipment, net | $ | 225,165 |  |  | $ | 230,461 |
Depreciation expense was $5,253 and $6,171 for the three months ended June 30, 2020 and 2019, respectively, and $10,529 and $12,038 for the six months ended June 30, 2020 and 2019, respectively.

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration