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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