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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 |

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