DERIVATIVE INSTRUMENTS 2 (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Fair value Derivative Assets	$ 1,356	$ 2,263
Fair value Derivative Liabilities	11,809	20,653
Commodity Contract [Member] | Derivatives-Energy Related-Current [Member]
Derivatives, Fair Value [Line Items]
Fair value Derivative Assets	746	2,263
Fair value Derivative Liabilities	3,418	11,385
Commodity Contract [Member] | Derivatives-Energy Related-NonCurrent [Member]
Derivatives, Fair Value [Line Items]
Fair value Derivative Assets	610	0
Fair value Derivative Liabilities	26	1,122
Interest Rate Contract [Member] | Derivatives-Other [Member]
Derivatives, Fair Value [Line Items]
Fair value Derivative Assets	0	0
Fair value Derivative Liabilities	$ 8,365	$ 8,146