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DERIVATIVE INSTRUMENTS - Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities | Interest Rate Swap    
Derivative [Line Items]    
Derivative instruments - interest rate swaps $ 17,360 $ 7,607