ASSETS HELD FOR SALE, DIVESTITURES AND DISCONTINUED OPERATIONS Additional Information (Details) (USD $)		12 Months Ended		3 Months Ended		12 Months Ended					0 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Shallow Upper Devonian Sale [Member]	Dec. 31, 2013 Piceance and NECO Asset Group [Member]	Mar. 31, 2012 Permian Basin [Member]	Dec. 31, 2011 Permian Basin [Member]	Dec. 31, 2011 Permian Basin [Member]	Dec. 31, 2013 Segment, Discontinued Operations [Member]	Dec. 31, 2012 Segment, Discontinued Operations [Member]	Dec. 31, 2011 Segment, Discontinued Operations [Member]	Sep. 30, 2013 Shallow Upper Devonian Letter of Credit [Member]	Oct. 08, 2013 Shallow Upper Devonian Sale [Member] PDCE proportionate share
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Shallow Upper Devonian wells divested	3,500
Oil and gas assets sale price before adjustments		$ 20,600,000			$ 173,900,000						$ 5,100,000
Proceeds from Sale of Oil and Gas Property and Equipment		900,000	177,600,000	189,200,000		13,200,000
Proceeds To NonAffiliated Investor Partners			17,000,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax			(2,300,000)	19,900,000			(2,330,000)	19,920,000	3,854,000
Notes Receivable from sale of oil and gas properties		3,300,000
Accounts Receivable from sale of oil and gas properties		800,000
Letters of Credit Outstanding, Amount ($)										$ 6,700,000