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LEASES - Lease Maturities ASC 840 (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 community
Operating leases |  |  |
Number of real estate properties | community |  |  | 148
Ground Leases |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | $ 4,901 |  |
2020 | 4,901 |  |
2021 | 4,901 |  |
2022 | 4,901 |  |
2023 | 4,901 |  |
Thereafter | 313,918 |  |
Total | 338,423 |  |
Office Space |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 | 76 |  |
2020 | 76 |  |
2021 | 32 |  |
Total | 184 |  |
Other operating expense | Ground Leases |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Rent expense | 7,300 | $ 6,200 |
General and administrative expense | Office Space |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Rent expense | $ 200 | $ 200 |

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