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DERIVATIVE INSTRUMENTS - Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Designated as Hedging Instrument | Accounts Payable and Accrued Expenses | Interest Rate Swap    
Derivative [Line Items]    
Total derivative instruments designated as hedging instruments - interest rate swaps $ 12,064 $ 15,905