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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Unfunded Loan Commitments |  |  |  |
Tenant reimbursements | $ 1.6 | $ 3.6 |  |
Provision for loan losses |  |  |  |
Unfunded Loan Commitments |  |  |  |
Unfunded commitments of mortgage loan receivables held for investment | 375.9 |  |  | $ 379.8
Accounting Standards Update 2016-02 |  |  |  |
Unfunded Loan Commitments |  |  |  |
Operating lease liability | 3.3 |  | $ 3.5 |
Operating lease, right-of-use asset | $ 3.2 |  | $ 3.3 |

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