ORGANIZATION AND ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Oil and Gas Properties
Discount rate applied to estimated future net revenues from proved oil and gas reserves (as a percent)	10.00%
Cash and Cash Equivalents
Number of financial institutions holding majority of the entity's cash and cash equivalents	1
Phillips 66
Revenue Recognition
Percentage of total oil and natural gas sold accounted for by the largest purchasers and marketers for the company's production	55.00%	52.00%	55.00%
Anadarko Energy Services
Revenue Recognition
Percentage of total oil and natural gas sold accounted for by the largest purchasers and marketers for the company's production	38.00%	38.00%	33.00%