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GUARANTEES (Details) - USD ($)
Jun. 15, 2016
Mar. 31, 2018
Dec. 31, 2017
Backstop Guarantee      
Guarantor Obligations [Line Items]      
Representation and warranty breach, threshold period for likely occurance 5 years    
Maximum amount of estimated future payments under the backstop guarantees   $ 795,335,424 $ 629,278,629
Minimum available liquidity $ 5,000,000.0    
Minimum available liquidity, percentage of aggregate unpaid principal balance 0.10%    
Indemnification Agreement      
Guarantor Obligations [Line Items]      
Maximum amount of estimated future payments under the backstop guarantees   $ 0