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FAIR VALUE MEASUREMENT (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effect of derivative instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 19,656,236us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ 10,764,226us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	$ (4,369,173)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Foreign exchange option contracts
Effect of derivative instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Income on Derivatives		304,582us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember	428,340us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember
Foreign exchange forward contracts
Effect of derivative instruments on consolidated statements of operations
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 19,656,236us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ 10,459,644us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	$ (4,797,513)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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