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DERIVATIVES - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
N
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
N
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Derivative [Line Items]              
Net interest expense $ (32,149,000)   $ (30,085,000)   $ (95,867,000) $ (89,360,000)  
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]              
Derivative [Line Items]              
Notional amount 270,000,000.0       270,000,000.0   $ 245,000,000.0
Net interest expense 1,100,000   289,000   2,400,000 915,000  
Unrealized after-tax gain of accumulated other comprehensive income (loss)   $ 26,000   $ 189,000      
Interest income $ 5,000   $ 81,000   $ 85,000 $ 142,000  
Derivative number of instruments terminated | N   3   4