SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Oil, Natural Gas, and NGL Sales) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 purchaser	Dec. 31, 2012 purchaser	Dec. 31, 2011 purchaser
Oil, Natural gas, and NGL sales
Gas imbalance liability	$ 4,300,000	$ 7,500,000
Gas imbalance asset	3,400,000	6,700,000
Total number of purchasers with sales of total revenues from continuing operations greater than 10%	2	2	1
Amount of revenue from major purchaser	441,672,000	605,659,000	704,557,000
Purchaser One
Oil, Natural gas, and NGL sales
Amount of revenue from major purchaser (as a percent)	23.00%	19.00%	22.00%
Amount of revenue from major purchaser	102,500,000	117,200,000	151,900,000
Purchaser Two
Oil, Natural gas, and NGL sales
Amount of revenue from major purchaser (as a percent)	17.00%	14.00%
Amount of revenue from major purchaser	$ 73,500,000	$ 82,100,000