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DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details) - Commodity contracts	Dec. 31, 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) \| $ / MMBTU		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
April 2018 - December 2018 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
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
July 2018 - December 2018 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
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 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl		92,000
October 2018 - December 2018 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
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 \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		50.65
Ceilings (in dollars per Mmbtu's/Bbl's)		55.65
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
Ceilings (in dollars per Mmbtu's/Bbl's)	51.75
January 2019 - March 2019 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		46.75
Ceilings (in dollars per Mmbtu's/Bbl's)		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 - March 2019 \| Call option \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,350,000
Ceilings (in dollars per Mmbtu's/Bbl's)	62.64
January 2019 - March 2019 \| Call option \| Crude oil \| Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	62.64
January 2019 - March 2019 \| Call option \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	(1,350,000)
Ceilings (in dollars per Mmbtu's/Bbl's)	58.64
January 2019 - March 2019 \| Call option \| Crude oil \| Weighted Average
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	58.64
January 2019 - June 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	181,000
Floors (in dollars per Mmbtu's/Bbl's)	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00
January 2019 - June 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00
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	2,448,000	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	(2.80)	(1.02)
January 2019 - December 2019 \| Basis Swap \| Natural gas
Derivative and hedging activities
Volume in Bbl's \| bbl	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	3,650,000	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)	55.20	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)	53.87	50.24
Ceilings (in dollars per Mmbtu's/Bbl's)	60.07	55.70
January 2019 - December 2019 \| Collars \| Natural gas
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	8,760,000
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)	3.00
January 2019 - December 2019 \| Collars \| Natural gas \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	2.70
Ceilings (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	3.10
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 Mmbtu's \| MMBTU	1,460,000
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	29.08
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	30.15
January 2019 - December 2019 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	29.33
January 2019 - December 2019 \| WTI NYMEX Roll \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	1,825,000
Floors (in dollars per Mmbtu's/Bbl's)	0.35
January 2019 - December 2019 \| WTI NYMEX Roll \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	0.35
April 2019 - June 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	91,000
Floors (in dollars per Mmbtu's/Bbl's)	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	55.00
April 2019 - June 2019 \| 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)	55.00
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 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	460,000
July 2019 - December 2019 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Basis Differential	(2.40)
July 2019 - December 2019 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Basis Differential	(6.50)
July 2019 - December 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	(5.68)
July 2019 - December 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	552,000
July 2019 - December 2019 \| Collars \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	55.00
July 2019 - December 2019 \| Collars \| Crude oil \| Maximum
Derivative and hedging activities
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)	53.00
Ceilings (in dollars per Mmbtu's/Bbl's)	61.00
October 2019 - December 2019 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	460,000
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	4.00
October 2019 - December 2019 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Basis Differential	3.72
October 2019 - December 2019 \| Collars \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	92,000
Floors (in dollars per Mmbtu's/Bbl's)	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00
October 2019 - December 2019 \| Collars \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00
October 2019 - December 2019 \| Swaps \| Natural gas liquids
Derivative and hedging activities
Volume in Mmbtu's \| MMBTU	92,000
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	32.50
October 2019 - December 2019 \| Swaps \| Natural gas liquids \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's) \| $ / MMBTU	32.50
January 2020 - December 2020 \| Basis Swap \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	3,294,000
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	2.00
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	4.00
January 2020 - December 2020 \| Basis Swap \| Crude oil \| Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	2.95
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	2,342,400
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 \| Put options \| Crude oil
Derivative and hedging activities
Volume in Bbl's \| bbl	915,000
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