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RELATED PARTY TRANSACTIONS (Details) - Joint ventures related to affiliated real estate investments - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
RELATED PARTY TRANSACTIONS |  |  |
Management fees | $ 3.8 | $ 2.9 | $ 1.0
Mortgage loans receivable from consolidated joint ventures | $ 25.5 | 34.7 |
Acquisition fee (as a percent) | 0.50% |  |
Acquisition fees | $ 0.5 | 1.8 |
Amount due to the entity from joint venture | $ 7.5 | $ 3.3 |

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