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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Ineffectiveness included in net income |  |  | $ 0 |  |
Interest expense | $ 5,770,000 | $ 5,446,000 | 18,337,000 | $ 13,679,000 |
Unrealized loss to be reclassified as a reduction of interest expense |  |  | 0 |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 5,000,000 |  | 5,000,000 |  | $ 5,000,000
Interest expense |  |  | $ 495,000 | $ 516,000 | $ 687,000

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