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Property, Plant and Equipment - Summary of Impairment Expense by Project (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Total Impairment | $ 23,712 | $ 11,436
Kingsville Dome Project [Member] |  |
Total Impairment | 2,978 | 140
Rosita Project [Member] |  |
Total Impairment | 2,545 |
Vasquez Project [Member] |  |
Total Impairment | 221 |
Temrezli Project [Member] |  |
Total Impairment | 17,968 |
Cebolleta/Juan Tafoya Property [Member] |  |
Total Impairment |  | $ 11,296

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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=109223946&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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