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DERIVATIVE FINANCIAL INTSTRUMENTS - Summary of Outstanding Swaptions (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Assets, at Fair Value $ 16,885,000 $ 0
Payer Swaption [Member] | Less Than Or Equal To One Year [Member]    
Derivatives, Fair Value [Line Items]    
Swaption Cost 7,805,000  
Assets, at Fair Value $ 123,000  
Derivative Instruments Average Months To Expiration 1 month 14 days  
Notional Amount $ 700,000,000  
Derivative Average Fixed Interest Rate 3.20%  
Term (Years) 9 years