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PROPERTY, PLANT AND EQUIPMENT - Impairment Charges (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |
Total Impairment | $ 5,200 | $ 5,200 | $ 143
Kingsville Dome project |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total Impairment |  | 101 | $ 143
Rosita Project |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total Impairment |  | 1,161 |
Cebolleta/Juan Tafoya Property |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total Impairment |  | $ 3,938 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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