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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Line Items]    
Accounts payable $ 33,538,153us-gaap_AccountsPayableCurrent $ 39,201,642us-gaap_AccountsPayableCurrent
Accrued expenses 4,651,503us-gaap_AccruedLiabilitiesCurrent 3,839,531us-gaap_AccruedLiabilitiesCurrent
Accrued interest 540,862us-gaap_InterestPayableCurrent 716,575us-gaap_InterestPayableCurrent
Other accrued liabilities 1,471,276us-gaap_OtherAccruedLiabilitiesCurrent 2,120,630us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 40,201,794us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 45,878,378us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent