DERIVATIVES (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Dec. 31, 2014 bbl	Feb. 28, 2015 bbl	Nov. 30, 2012 item	Dec. 31, 2013 item	Dec. 31, 2012 item
Derivatives
Crude oil production per day associated with the put option (in barrels per day)	100,000
Natural Gas - Swaps through March 2014 (in cubic feet)
Derivatives
Daily Volume			50,000,000
Weighted-average strike price (in dollars per cubic foot)			0.00430
Crude Oil - Put Option through June 2015 (in dollars)
Derivatives
Fair value of the put option	24
Strike price (in dollars per barrel)	50
Crude Oil Collars July Through September 2015 | Subsequent event
Derivatives
Crude oil production per day associated with the put option (in barrels per day)		30,000
Crude Oil Collars July Through September 2015 | Subsequent event | Minimum
Derivatives
Strike price (in dollars per barrel)		55
Crude Oil Collars July Through September 2015 | Subsequent event | Maximum
Derivatives
Strike price (in dollars per barrel)		72
Crude Oil Put Option July Through September 2015 | Subsequent event
Derivatives
Crude oil production per day associated with the put option (in barrels per day)		40,000
Strike price (in dollars per barrel)		50
Crude Oil Call Option March Through June 2015 | Subsequent event
Derivatives
Crude oil production per day associated with the call option (in barrels per day)		30,000
Strike price (in dollars per barrel)		75
Fair Value Hedges
Derivatives
Number of hedges	0			0	0