DERIVATIVE INSTRUMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Commodity derivatives:
Realized losses (gains)	$ 4,296	$ 1,106	$ 8,756	$ (8,543)
Unrealized losses (gains)	7,345	(32,823)	15,736	2,338
Interest rate derivatives:
Realized gains	0	(9,803)	0	(12,885)
Unrealized losses	0	9,910	0	13,060
Realized and unrealized losses on derivative instruments, net	$ 11,641	$ (31,610)	$ 24,492	$ (6,030)