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Subsequent Events (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas sales |  | $ 17,156 | $ 18,178 | $ 20,425 | $ 21,266 | $ 15,326 | $ 14,635 | $ 18,847 | $ 10,976 | $ 77,025 | $ 59,784 | $ 80,445
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Oil and natural gas sales | $ 6,500 |  |  |  |  |  |  |  |  |  |  |
Net volume delivered (barrels) | bbl | 95,525 |  |  |  |  |  |  |  |  |  |  |
Lifting price increase | 7.10% |  |  |  |  |  |  |  |  |  |  |
Impact on revenue from lifting price increase | $ 500 |  |  |  |  |  |  |  |  |  |  |

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- Definition Revenue from the sale of oil and gas during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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