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FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
FAIR VALUE OF FINANCIAL INSTRUMENTS    
Realized Gain (Loss) on Derivatives Recognized in Income $ 14,459,540 $ 22,736,110
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income $ (341,900) $ 278,490