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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Restricted investments in US Treasury Bonds - available for sale, at fair value	$ 1,314	$ 1,415
Recurring \| Level 1
Assets
Restricted investments in US Treasury Bonds - available for sale, at fair value	1,314	1,415
Recurring \| Level 2
Assets
Commodity derivatives	43
Liabilities
Commodity derivatives	3,517	952
Recurring \| Total
Assets
Restricted investments in US Treasury Bonds - available for sale, at fair value	1,314	1,415
Commodity derivatives	43
Liabilities
Commodity derivatives	$ 3,517	$ 952

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details