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DERIVATIVES (Details) MMBTU in Thousands, $ in Millions	2 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2016 $ / bbl bbl	Mar. 31, 2014 $ / Mcf MMcf	Dec. 31, 2015 USD ($) MMBTU item $ / bbl $ / MMBTU bbl	Dec. 31, 2014 item	Dec. 31, 2013 item
Derivatives
Non-cash derivative gains recognized in revenues | $			$ 52
Natural Gas Index Based Hedges Third and Fourth Quarter 2015 Member
Derivatives
Average price | $ / MMBTU			3.01
Daily Volume (in MMbtu) | MMBTU			40
Natural Gas Collars Based Hedges Third and Fourth Quarter 2015 Member
Derivatives
Weighted average floor price (in dollars per barrel) | $ / MMBTU			2.80
Weighted average ceiling price (in dollars per barrel) | $ / MMBTU			3.17
Daily Volume (in MMbtu) | MMBTU			20
Crude Oil - Put Option January 2015 through June 2015
Derivatives
Crude oil production per day associated with the put option (in barrels per day) | bbl			100,000
Strike price (in dollars per barrel)			50
Crude Oil Call Option March Through June 2015
Derivatives
Crude oil production per day associated with the call option (in barrels per day) | bbl			30,000
Strike price (in dollars per barrel)			75
Cash Flow Hedges | Natural gas cash flow hedges first quarter 2014 member
Derivatives
Average price | $ / Mcf		4.30
Daily volume (in MMcf) | MMcf		50
Fair Value Hedges
Derivatives
Number of hedges | item			0	0	0
Crude oil brent based hedges | Fourth quarter 2015 oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			40,000
Weighted average floor price (in dollars per barrel)			61.25
Weighted average ceiling price (in dollars per barrel)			73.88
Crude oil brent based hedges | Calls | January through June 2016 crude oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			35,500
Weighted average ceiling price (in dollars per barrel)			66.15
Crude oil brent based hedges | Calls | January through March 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	35,500
Weighted average ceiling price (in dollars per barrel)	66.15
Crude oil brent based hedges | Calls | April through June 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	35,500
Weighted average ceiling price (in dollars per barrel)	66.15
Crude oil brent based hedges | Calls | July through December 2016 crude oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			3,000
Weighted average ceiling price (in dollars per barrel)			74.42
Crude oil brent based hedges | Calls | July Through September 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	3,000
Weighted average ceiling price (in dollars per barrel)	74.42
Crude oil brent based hedges | Calls | October Through December 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	3,000
Weighted average ceiling price (in dollars per barrel)	74.42
Crude oil brent based hedges | Calls | January through December 2017 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	30,000
Weighted average ceiling price (in dollars per barrel)	55.68
Crude oil brent based hedges | Calls | January Through December 2018 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	23,300
Weighted average ceiling price (in dollars per barrel)	57.99
Crude oil brent based hedges | Puts | January through June 2016 crude oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			30,500
Weighted average floor price (in dollars per barrel)			52.38
Crude oil brent based hedges | Puts | January through March 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	33,800
Weighted average floor price (in dollars per barrel)	51.75
Crude oil brent based hedges | Puts | April through June 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	55,500
Weighted average floor price (in dollars per barrel)	50.14
Crude oil brent based hedges | Puts | July through December 2016 crude oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			3,000
Weighted average floor price (in dollars per barrel)			50.00
Crude oil brent based hedges | Puts | July Through September 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	28,000
Weighted average floor price (in dollars per barrel)	50.65
Crude oil brent based hedges | Puts | October Through December 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	3,000
Weighted average floor price (in dollars per barrel)	50.00
Crude oil brent based hedges | Swap | July through December 2016 crude oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			1,000
Strike price (in dollars per barrel)			61.25
Crude oil brent based hedges | Swap | July Through September 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	1,000
Average price	61.25
Crude oil brent based hedges | Swap | October Through December 2016 crude oil production member | Subsequent event
Derivatives
Crude oil production per day (in barrels per day) | bbl	1,000
Average price	61.25
Crude oil brent based hedges at weighted average floor price member | Third quarter 2015 oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			70,000
Weighted average floor price (in dollars per barrel)			52.14
Crude oil brent based hedges at weighted average ceiling price member | Third quarter 2015 oil production member
Derivatives
Crude oil production per day (in barrels per day) | bbl			30,000
Weighted average ceiling price (in dollars per barrel)			72.12

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