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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, 2016 | Dec. 31, 2015
Total Impairment | $ 1,673 | $ 960
Kingsville Dome Project [Member] |  |
Total Impairment | 160 | 160
Butler Ranch Project [Member] |  |
Total Impairment | 579 |
Sejita Dome Project [Member] |  |
Total Impairment | 534 |
Nell Project [Member] |  |
Total Impairment | 209 |
Jack Pump Project [Member] |  |
Total Impairment | 191 |
Alta Mesa Este Project [Member] |  |
Total Impairment |  | $ 800

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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