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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedge on Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Interest Income | Interest Rate Swap |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Interest rate swap, net of income taxes | $ 2,048 | $ 2,047 | $ 6,076 | $ 5,629

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