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DERIVATIVE INSTRUMENTS - Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
INTEREST RATE CAP AGREEMENTS |  |  |  |
Total consolidated interest expense | $ 4,470 | $ 5,473 | $ 9,012 | $ 12,418
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20: |  |  |  |
Interest contracts: Premium excluded and recognized on an amortized basis | $ 42 |  | $ 111 |

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