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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - Warrant
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
tranche
Sep. 30, 2015
USD ($)
Derivative [Line Items]        
Number of tranches | tranche     5  
Recorded gain on change in estimated fair value of warrants   $ 30.0    
Recorded loss on change in estimated fair value of warrants $ 10.1   $ 4.8 $ 36.2