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DERIVATIVES AND FAIR VALUE MEASUREMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Inception Date	Feb. 01, 2011	Feb. 01, 2011
Derivative, Maturity Date	Jan. 24, 2021	Jan. 24, 2021
Interest Rate Swap [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	996,600	1,032,000
Fair value at year-end	(112,299)	(94,882)

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

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