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DERIVATIVE AND HEDGING ACTIVITIES - Number of Contracts (Details) - Derivatives not designated as hedging contracts - Commodity contracts - item	Mar. 31, 2019	Dec. 31, 2018
Derivative and hedging activities
Number of open commodity derivative contracts	56	86
Collars | Natural gas
Derivative and hedging activities
Number of open commodity derivative contracts	6	9
Collars | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	15	31
Basis Swap | Natural gas
Derivative and hedging activities
Number of open commodity derivative contracts	7	7
Basis Swap | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	17	26
Put options | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	2	2
Call option | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	2	4
WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	1	1
Swap | Natural gas liquids
Derivative and hedging activities
Number of open commodity derivative contracts	5	6
Swap | Crude oil
Derivative and hedging activities
Number of open commodity derivative contracts	1

X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

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+ References

No definition available.

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