DERIVATIVE INSTRUMENTS - Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST RATE CAP AGREEMENTS
Total consolidated interest expense	$ 3,943	$ 5,097	$ 12,955	$ 17,515
Gain or (loss) on cash flow hedging relationships in Subtopic 815-20:
Interest contracts: Premium excluded and recognized on an amortized basis	$ 43		$ 153

Amount of the cost of borrowed funds accounted for as interest expense.

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