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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 |  |  |  |

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