DERIVATIVE INSTRUMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative contracts not designated as hedging instruments and their balance sheet location
Derivative instruments, current assets	$ 713	$ 5,192
Derivative instruments, long-term assets	2,216	400
Derivative instruments, current liabilities	9,598	4,542
Derivative instruments, long-term liabilities	672	0
Commodity \| Not Designated as Hedging Instrument
Derivative contracts not designated as hedging instruments and their balance sheet location
Derivative instruments, current assets	713	5,192
Derivative instruments, long-term assets	2,216	400
Derivative instruments, current liabilities	9,598	4,542
Derivative instruments, long-term liabilities	$ 672	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details