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DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) instrument | Jun. 30, 2019 USD ($)
Derivatives |  |  |  |
Unrealized holding gain/(loss) | $ (294) | $ (4,311) | $ (3,211) | $ (6,522)
Unsecured Commercial Bank Credit Facility |  |  |  |
Derivatives |  |  |  |
Total revolving credit facility | $ 2,000,000 |  | $ 2,000,000 |
Designated as Hedging Instrument | Interest rate swap and caps |  |  |  |
Derivatives |  |  |  |
Number of Interest Rate Derivatives Held | instrument | 2 |  | 2 |
Notional | $ 334,880 |  | $ 334,880 |
Not Designated as Hedging Instrument |  |  |  |
Derivatives |  |  |  |
Notional | $ 0 |  | $ 0 |

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