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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 03, 2017 | Mar. 31, 2019 | Mar. 05, 2019 | Dec. 12, 2018 | Mar. 13, 2017 | Oct. 18, 2016
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Fees for legal expenses |  | $ 200 |  |  |  |
Compensation amount (more than) |  | 120 |  |  |  |
Affiliated Entity |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Investment in mutual fund |  | $ 800 |  |  |  | $ 10,000
Fee earned on assets under management (as percentage) |  | 0.75% |  |  |  |
Fund's cap expense (as percentage) |  | 0.95% |  |  |  |
Affiliated Entity | Related Reserve IV LLC | B Participation Interest |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Mortgage loan participation purchased by related party |  |  |  |  | $ 4,000 |
Participating mortgage loan amount (up to) |  |  |  |  | $ 136,500 |
Percentage of loans receivable with fixed rates of interest |  |  |  |  | 17.00% |
Affiliated Entity | Brickell Heights Commercial LLC | First mortgage loan |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Loans receivable from related party |  |  | $ 14,300 | $ 6,400 |  |
Consolidated Joint Venture | The Related Group of Florida | First mortgage loan |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Interest income, related party |  | $ 100 |  |  |  |
Brickell Heights Commercial LLC | Consolidated Joint Venture | Related Special Assets LLC |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Ownership Interest (percent) |  |  | 0.68% | 12.00% |  |
Class A Common Stock | Related |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Related party purchases of shares from shareholders | $ 80,000 |  |  |  |  |
Participation Financing - Mortgage Loan Receivable | Affiliated Entity | Related Reserve IV LLC | B Participation Interest |  |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |  |
Interest expense, debt |  | $ 100 |  |  |  |

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