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DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
instrument
Mar. 31, 2019
USD ($)
Derivatives    
Unrealized holding gain/(loss) $ (2,917) $ (2,210)
Unsecured Commercial Bank Credit Facility    
Derivatives    
Total revolving credit facility $ 2,000,000  
Designated as Hedging Instrument | Interest rate swaps    
Derivatives    
Number of Interest Rate Derivatives Held | instrument 1  
Notional $ 315,000  
Not Designated as Hedging Instrument | Interest rate caps    
Derivatives    
Number of Interest Rate Derivatives Held | instrument 1  
Notional $ 19,880