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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Derivative [Line Items]          
Ineffectiveness included in net income     $ 0   $ 0
Interest expense $ 4,567,000 $ 2,993,000 8,233,000 $ 5,888,000  
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     $ 343,000 $ 395,000