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RELATED-PARTY TRANSACTIONS - Sabal Loan (Details) - Loan Purchase Commitments - Limited Liability Company Controlled By Affiliate Of Greater Than 5% Shareholder, Oaktree - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Jul. 31, 2018
Jun. 11, 2017
Jun. 26, 2015
Related Party Transaction [Line Items]          
Committed revolving repurchase facility       $ 40,000,000 $ 35,000,000
Largest aggregate amount of principal outstanding during period $ 32,500,000 $ 94,700,000      
Amount outstanding 0 23,600,000 $ 3,500,000    
Proceeds from principal 210,400,000 600,400,000      
Proceeds from interest 370,000 $ 1,100,000      
Maximum          
Related Party Transaction [Line Items]          
Committed revolving repurchase facility $ 100,000,000