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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Level 1
Assets
Restricted investments in US Treasury Bonds - available for sale, at fair value	$ 1,459	$ 1,422
Level 2
Assets
Commodity derivatives	3,968	4,005
Fair value
Assets
Restricted investments in US Treasury Bonds - available for sale, at fair value	1,459	1,422
Commodity derivatives	$ 3,968	$ 4,005

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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