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DERIVATIVE AND HEDGING ACTIVITIES - Open Contracts (Details) - Commodity contracts	Jun. 30, 2019 $ / bbl bbl	Dec. 31, 2018 MMBTU $ / MMBTU $ / bbl bbl
July 2019 - September 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
July 2019 - September 2019 | Collars | Crude oil | Minimum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	62.85
July 2019 - September 2019 | Collars | Crude oil | Maximum
Derivative and hedging activities
Ceilings (in dollars per Mmbtu's/Bbl's)	63.00
July 2019 - September 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)	62.93
July 2019 - September 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	184,000
July 2019 - September 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	(6.20)
July 2019 - September 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	(7.60)
July 2019 - September 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	(6.90)
July 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	1,472,000	552,000
July 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
July 2019 - December 2019 | Collars | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	55.85	55.00
Ceilings (in dollars per Mmbtu's/Bbl's)	61.70	69.00
July 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	52.48	53.00
Ceilings (in dollars per Mmbtu's/Bbl's)	58.61	61.00
July 2019 - December 2019 | Collars | Natural gas
Derivative and hedging activities
Volume in Bbl's | bbl	4,416,000
July 2019 - December 2019 | Collars | Natural gas | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	2.52
Ceilings (in dollars per Mmbtu's/Bbl's)	3.00
July 2019 - December 2019 | Collars | Natural gas | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	2.70
Ceilings (in dollars per Mmbtu's/Bbl's)	3.10
July 2019 - December 2019 | Collars | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	2.60
Ceilings (in dollars per Mmbtu's/Bbl's)	3.01
July 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	736,000	460,000
July 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	(0.98)	(2.40)
July 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	(6.50)	(6.50)
July 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	(3.95)	(5.68)
July 2019 - December 2019 | Basis Swap | Natural gas
Derivative and hedging activities
Volume in Bbl's | bbl	4,692,000
July 2019 - December 2019 | Basis Swap | Natural gas | Minimum
Derivative and hedging activities
Basis Differential	(1.05)
July 2019 - December 2019 | Basis Swap | Natural gas | Maximum
Derivative and hedging activities
Basis Differential	(1.40)
July 2019 - December 2019 | Basis Swap | Natural gas | Weighted Average
Derivative and hedging activities
Basis Differential	(1.18)
July 2019 - December 2019 | Swap | Natural gas liquids
Derivative and hedging activities
Volume in Bbl's | bbl	644,000
July 2019 - December 2019 | Swap | Natural gas liquids | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.08
July 2019 - December 2019 | Swap | Natural gas liquids | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.50
July 2019 - December 2019 | Swap | Natural gas liquids | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	29.21
July 2019 - December 2019 | WTI NYMEX Roll | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	920,000
Floors (in dollars per Mmbtu's/Bbl's)	0.35
July 2019 - December 2019 | WTI NYMEX Roll | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	0.35
October 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	92,000	92,000
Floors (in dollars per Mmbtu's/Bbl's)	51.00	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00	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	51.00
Ceilings (in dollars per Mmbtu's/Bbl's)	56.00	56.00
October 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	460,000	460,000
October 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	3.45	3.45
October 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	4.00	4.00
October 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	3.72	3.72
October 2019 - December 2019 | Swap | Natural gas liquids
Derivative and hedging activities
Volume in Bbl's | bbl		92,000
Floors (in dollars per Mmbtu's/Bbl's)		32.50
October 2019 - December 2019 | Swap | Natural gas liquids | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		32.50
January 2020 - December 2020 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	549,000	549,000
Floors (in dollars per Mmbtu's/Bbl's)	50.00	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00	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	50.00
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00	70.00
January 2020 - December 2020 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	3,294,000	3,294,000
January 2020 - December 2020 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential	2.00	2.00
January 2020 - December 2020 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential	4.00	4.00
January 2020 - December 2020 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential	2.95	2.95
January 2020 - December 2020 | Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	366,000
Floors (in dollars per Mmbtu's/Bbl's)	60.00
January 2020 - December 2020 | Swap | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)	60.00
January 2020 - December 2020 | Call option | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	2,342,400	2,342,400
Ceilings (in dollars per Mmbtu's/Bbl's)	70.00	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	70.00
January 2020 - December 2020 | Put options | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl	915,000	915,000
Floors (in dollars per Mmbtu's/Bbl's)	55.00	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	55.00
January 2019 - March 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		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 | 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
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) | $ / MMBTU		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 | $ / MMBTU		(6.20)
January 2019 - September 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential | $ / MMBTU		(7.60)
January 2019 - September 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential | $ / MMBTU		(6.90)
January 2019 - December 2019 | Collars | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		3,650,000
January 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)		55.20
January 2019 - December 2019 | Collars | Crude oil | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		58.00
Ceilings (in dollars per Mmbtu's/Bbl's)		63.00
January 2019 - December 2019 | Collars | Crude oil | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		53.87
Ceilings (in dollars per Mmbtu's/Bbl's)		60.07
January 2019 - December 2019 | Collars | Natural gas
Derivative and hedging activities
Volume in Bbl's | bbl		8,760,000
January 2019 - December 2019 | Collars | Natural gas | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		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)		2.70
Ceilings (in dollars per Mmbtu's/Bbl's)		3.10
January 2019 - December 2019 | Collars | Natural gas | Weighted Average
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		2.60
Ceilings (in dollars per Mmbtu's/Bbl's)		3.01
January 2019 - December 2019 | Basis Swap | Crude oil
Derivative and hedging activities
Volume in Bbl's | bbl		2,448,000
January 2019 - December 2019 | Basis Swap | Crude oil | Minimum
Derivative and hedging activities
Basis Differential		(0.98)
January 2019 - December 2019 | Basis Swap | Crude oil | Maximum
Derivative and hedging activities
Basis Differential		(6.50)
January 2019 - December 2019 | Basis Swap | Crude oil | Weighted Average
Derivative and hedging activities
Basis Differential		(2.80)
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		(1.05)
January 2019 - December 2019 | Basis Swap | Natural gas | Maximum
Derivative and hedging activities
Basis Differential		(1.40)
January 2019 - December 2019 | Basis Swap | Natural gas | Weighted Average
Derivative and hedging activities
Basis Differential		(1.18)
January 2019 - December 2019 | Swap | Natural gas liquids
Derivative and hedging activities
Volume in Bbl's | bbl		1,460,000
January 2019 - December 2019 | Swap | Natural gas liquids | Minimum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		29.08
January 2019 - December 2019 | Swap | Natural gas liquids | Maximum
Derivative and hedging activities
Floors (in dollars per Mmbtu's/Bbl's)		30.15
January 2019 - December 2019 | Swap | 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 Mmbtu's | MMBTU		1,825,000
Floors (in dollars per Mmbtu's/Bbl's) | $ / MMBTU		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) | $ / MMBTU		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

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