DERIVATIVE AND HEDGING ACTIVITIES (Details) (USD $)																												1 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Derivatives not designated as hedging	Dec. 31, 2012 Derivatives not designated as hedging	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Current assets - receivables from derivative contracts	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Current assets - receivables from derivative contracts	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Other noncurrent assets - receivables from derivative contracts	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Other noncurrent assets - receivables from derivative contracts	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Current liabilities - liabilities from derivative contracts	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Current liabilities - liabilities from derivative contracts	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Other noncurrent liabilities - liabilities from derivative contracts	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Other noncurrent liabilities - liabilities from derivative contracts	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Collars Natural gas item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Collars Natural gas item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Collars Crude oil item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Collars Crude oil item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Swaps Natural gas item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Swaps Crude oil item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Swaps Crude oil item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Basis Swap Natural gas item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Three-way collars Crude oil item	Dec. 31, 2012 Derivatives not designated as hedging Commodity contracts Three-way collars Crude oil item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Put options Crude oil item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Swaptions Crude oil item	Dec. 31, 2013 Derivatives not designated as hedging Commodity contracts Extendable collars Crude oil item	Feb. 29, 2012 Derivatives not designated as hedging Senior Credit Agreement Commodity contracts Net gain (loss) on derivative contracts	Feb. 29, 2012 Derivatives not designated as hedging Senior Credit Agreement Interest rate swaps Net gain (loss) on derivative contracts	Jun. 30, 2011 Derivatives not designated as hedging March 2011 Credit Facilities Commodity contracts Net gain (loss) on derivative contracts
Derivative and hedging activities
Realized loss for novation fees																												$ 400,000		$ 500,000
Realized loss from termination of interest rate derivatives																													600,000	900,000
Number of open commodity derivative contracts					86	47									10	2	52	28	2	8	4	1	5	10	1	8	2
Asset derivative contracts	24,762,000	7,799,000	24,762,000	7,799,000			2,028,000	7,428,000	22,734,000	371,000
Liability derivative contracts	$ (37,192,000)	$ (12,890,000)	$ (37,192,000)	$ (12,890,000)							$ (17,859,000)	$ (10,429,000)	$ (19,333,000)	$ (2,461,000)