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OIL AND NATURAL GAS PROPERTIES (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 07, 2017 USD ($) subsidiary | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) $ / bbl | Sep. 30, 2019 USD ($) $ / MMBTU $ / bbl | Sep. 30, 2018 USD ($) $ / MMBTU $ / bbl | Dec. 31, 2017 USD ($)
Ceiling Limitation Disclosures |  |  |  |  |  |  |
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl |  |  |  | 61.45 | 57.69 | 63.43 |
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU |  |  |  |  | 2.870 | 2.91 |
Book value of oil and natural gas properties exceeding ceiling limit |  | $ 275,200 |  | $ 664,400 | $ 45,600 |  |
Amount of unevaluated property costs transferred to the full cost pool |  | $ 51,000 |  | $ 481,700 |  |  |
Percentage of ownership interest sold | 100.00% |  |  |  |  |  |
No of subsidiaries whose ownership interest sold | subsidiary | 2 |  |  |  |  |  |
Adjusted sale price | $ 1,390,000 |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  | $ (1,331) |  |  | $ (7,235) | $ 485,900

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- Definition It represents the information about number of subsidiary, ownership interest sold. + References No definition available. + Details
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- Definition Represents the per unit first day average of the Henry Hub natural gas price for the twelve months ended as of the reporting date. + References No definition available. + Details
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- Definition Represents the per unit first day average of the West Texas Intermediate (WTI) crude oil spot price. + References No definition available. + Details
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- Definition Represents the amount of unevaluated property costs transferred to the full cost pool. + References No definition available. + Details
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- Definition It represents the Percentage of ownership interest sold. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties. + 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=118932676&loc=d3e3602-108585 + Details
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- Definition The cash inflow associated with the deconsolidation of a previously consolidated subsidiary or sale of an entity that is related to it but not strictly controlled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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