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RELATED PARTY TRANSACTIONS - Other (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Chairman | General and administrative expense |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fees under compensation and services agreement | $ 289,000 | $ 276,000 | $ 276,000
Vice Chairman | General and administrative expense |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Fees under compensation and services agreement | $ 116,000 | $ 110,000 | 110,000
Gould Investors L.P. |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Number of common stock shares owned by the related party | 1,785,976 | 1,785,976 |
Ownership percentage held by the related party | 9.00% | 9.20% |
Amount of insurance reimbursed | $ 1,025,000 | $ 912,000 | 790,000
Gould Investors L.P. | Real estate expenses |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Insurance expense recognized of amounts reimbursed to related party | $ 927,000 | $ 877,000 | $ 757,000

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