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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

X

- Definition

The amount of increase in the book value of oil and natural gas properties exceeding the ceiling limit.

+ References

No definition available.

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It represents the information about number of subsidiary, ownership interest sold.

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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.

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- Definition

Represents the per unit first day average of the West Texas Intermediate (WTI) crude oil spot price.

+ References

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- Definition

Represents the amount of unevaluated property costs transferred to the full cost pool.

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- Definition

It represents the Percentage of ownership interest sold.

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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

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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

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