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DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details) - Commodity contracts	Sep. 30, 2018 MMBTU $ / MMBTU $ / bbl bbl	Dec. 31, 2017 MMBTU $ / MMBTU $ / bbl bbl
January 2018 - December 2018 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		2,555,000
January 2018 - December 2018 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential		(1.05)
January 2018 - December 2018 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential		(1.50)
January 2018 - December 2018 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential		(1.29)
January 2018 - December 2018 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		2,920,000
January 2018 - December 2018 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		45.00
Ceilings (in dollars per Mmbtu's/Bbl's)		50.00
January 2018 - December 2018 \| Collars \| Crude oil \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		53.00
Ceilings (in dollars per Mmbtu's/Bbl's)		60.00
January 2018 - December 2018 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		49.29
Ceilings (in dollars per Mmbtu's/Bbl's)		56.82
January 2018 - December 2018 \| Collars \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU		2,737,500
January 2018 - December 2018 \| Collars \| Natural gas \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.00
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.22
January 2018 - December 2018 \| Collars \| Natural gas \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.03
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.38
January 2018 - December 2018 \| Collars \| Natural gas \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.01
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU		3.30
April 2018 - December 2018 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		275,000
Basis Differential		(1.15)
April 2018 - December 2018 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential		(1.15)
April 2018 - December 2018 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		275,000
Floors (in dollars per Mmbtu's/Bbl's)		46.75
Ceilings (in dollars per Mmbtu's/Bbl's)		51.75
April 2018 - December 2018 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		46.75
Ceilings (in dollars per Mmbtu's/Bbl's)		51.75
July 2018 - December 2018 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		1,012,000
July 2018 - December 2018 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential		(0.98)
July 2018 - December 2018 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential		(1.18)
July 2018 - December 2018 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential		(1.12)
July 2018 - December 2018 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		184,000
Floors (in dollars per Mmbtu's/Bbl's)		48.50
Ceilings (in dollars per Mmbtu's/Bbl's)		53.50
July 2018 - December 2018 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		48.50
Ceilings (in dollars per Mmbtu's/Bbl's)		53.50
October 2018 - December 2018 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,012,000
October 2018 - December 2018 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	(6.90)
October 2018 - December 2018 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	(12.50)
October 2018 - December 2018 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	(10.64)
October 2018 - December 2018 \| Basis Swap \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	1,380,000
October 2018 - December 2018 \| Basis Swap \| Natural gas \| Minimum
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.05)
October 2018 - December 2018 \| Basis Swap \| Natural gas \| Maximum
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.19)
October 2018 - December 2018 \| Basis Swap \| Natural gas \| Weighted Average
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.10)
October 2018 - December 2018 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,196,000	92,000
Floors (in dollars per Mmbtu's/Bbl's)		50.65
Ceilings (in dollars per Mmbtu's/Bbl's)		55.65
October 2018 - December 2018 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	45.00
Ceilings (in dollars per Mmbtu's/Bbl's)	50.00
October 2018 - December 2018 \| Collars \| Crude oil \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.80
Ceilings (in dollars per Mmbtu's/Bbl's)	63.00
October 2018 - December 2018 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	50.08	50.65
Ceilings (in dollars per Mmbtu's/Bbl's)	56.87	55.65
October 2018 - December 2018 \| Collars \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	690,000
October 2018 - December 2018 \| Collars \| Natural gas \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.00
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.22
October 2018 - December 2018 \| Collars \| Natural gas \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.03
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.38
October 2018 - December 2018 \| Collars \| Natural gas \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.01
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.30
October 2018 - December 2018 \| Swaps \| Natural gas liquids
Derivative and hedging activities
Volume in Bbl's \| bbl	92,000
October 2018 - December 2018 \| Swaps \| Natural gas liquids \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	32.50
October 2018 - December 2018 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	32.50
October 2018 - December 2018 \| WTI NYMEX Roll \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	460,000
Basis Differential	0.35
October 2018 - December 2018 \| WTI NYMEX Roll \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	0.35
October 2018 - December 2018 with weighted average price of $59.92 \| Call option \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,196,000
October 2018 - December 2018 with weighted average price of $59.92 \| Call option \| Crude oil \| Minimum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	59.00
October 2018 - December 2018 with weighted average price of $59.92 \| Call option \| Crude oil \| Maximum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	63.00
October 2018 - December 2018 with weighted average price of $59.92 \| Call option \| Crude oil \| Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	59.92
October 2018 - December 2018 with weighted average price of $56.87 \| Call option \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	(1,196,000)
October 2018 - December 2018 with weighted average price of $56.87 \| Call option \| Crude oil \| Minimum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	50.00
October 2018 - December 2018 with weighted average price of $56.87 \| Call option \| Crude oil \| Maximum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	63.00
October 2018 - December 2018 with weighted average price of $56.87 \| Call option \| Crude oil \| Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	56.87
January 2019 - March 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	90,000	90,000
Floors (in dollars per Mmbtu's/Bbl's)	46.75	46.75
Ceilings (in dollars per Mmbtu's/Bbl's)	51.75	51.75
January 2019 - March 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	46.75	46.75
Ceilings (in dollars per Mmbtu's/Bbl's)	51.75	51.75
January 2019 - June 2019 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	543,000
January 2019 - June 2019 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	(1.15)
January 2019 - June 2019 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	(1.33)
January 2019 - June 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	(1.22)
January 2019 - September 2019 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	546,000
January 2019 - September 2019 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	(6.20)
January 2019 - September 2019 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	(7.60)
January 2019 - September 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	(6.90)
January 2019 - December 2019 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	2,365,000	4,380,000
January 2019 - December 2019 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	(0.98)	(0.50)
January 2019 - December 2019 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	(6.50)	(1.33)
January 2019 - December 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	(3.73)	(1.02)
January 2019 - December 2019 \| Basis Swap \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	9,307,500
January 2019 - December 2019 \| Basis Swap \| Natural gas \| Minimum
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.05)
January 2019 - December 2019 \| Basis Swap \| Natural gas \| Maximum
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.40)
January 2019 - December 2019 \| Basis Swap \| Natural gas \| Weighted Average
Derivative and hedging activities
Basis Differential \| $ / MMBTU	(1.18)
January 2019 - December 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	5,110,000	1,825,000
January 2019 - December 2019 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	50.00	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	55.00	55.00
January 2019 - December 2019 \| Collars \| Crude oil \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	58.00	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	63.00	57.30
January 2019 - December 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	53.12	50.24
Ceilings (in dollars per Mmbtu's/Bbl's)	58.98	55.70
January 2019 - December 2019 \| Collars \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	8,395,000
January 2019 - December 2019 \| Collars \| Natural gas \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	2.52
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.00
January 2019 - December 2019 \| Collars \| Natural gas \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	2.65
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.03
January 2019 - December 2019 \| Collars \| Natural gas \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	2.60
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.01
January 2019 - December 2019 \| Swaps \| Natural gas liquids
Derivative and hedging activities
Volume in Bbl's \| bbl	1,460,000
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.08
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	30.15
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.33
January 2019 - December 2019 \| WTI NYMEX Roll \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,825,000
Basis Differential	0.35
January 2019 - December 2019 \| WTI NYMEX Roll \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	0.35
April 2019 - December 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	275,000
Floors (in dollars per Mmbtu's/Bbl's)	55.00
Ceilings (in dollars per Mmbtu's/Bbl's)	62.85
April 2019 - December 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.00
Ceilings (in dollars per Mmbtu's/Bbl's)	62.85
July 2019 - December 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	184,000
Floors (in dollars per Mmbtu's/Bbl's)	55.00
Ceilings (in dollars per Mmbtu's/Bbl's)	69.00
July 2019 - December 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.00
Ceilings (in dollars per Mmbtu's/Bbl's)	69.00
October 2019 - December 2019 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	368,000
October 2019 - December 2019 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	3.45
October 2019 - December 2019 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	3.75
October 2019 - December 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	3.65
October 2019 - December 2019 \| Swaps \| Natural gas liquids
Derivative and hedging activities
Volume in Bbl's \| bbl	92,000
October 2019 - December 2019 \| Swaps \| Natural gas liquids \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	32.50
October 2019 - December 2019 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	32.50
January 2020 - December 2020 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	2,928,000
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	2.00
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	3.75
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	2.82
January 2020 - December 2020 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	549,000
Floors (in dollars per Mmbtu's/Bbl's)	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00
January 2020 - December 2020 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00
January 2020 - December 2020 \| Call option \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,464,000
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00
January 2020 - December 2020 \| Call option \| Crude oil \| Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00
January 2020 - December 2020 \| Swaps \| Natural gas liquids
Derivative and hedging activities
Volume in Bbl's \| bbl	732,000
Floors (in dollars per Mmbtu's/Bbl's)	31.00
January 2020 - December 2020 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	31.00
January 2020 - December 2020 \| Put options \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	915,000
January 2020 - December 2020 \| Put options \| Crude oil \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.00
January 2020 - December 2020 \| Put options \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.00