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DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) item instrument | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 31, 2019 USD ($)
Derivatives |  |  |  |
Unrealized holding gain/(loss) | $ (8,437) | $ 4,806 | $ 1,802 |
Unsecured Commercial Bank Credit Facility |  |  |  |
Derivatives |  |  |  |
Total revolving credit facility | $ 2,000,000 |  |  |
3.20% Medium-Term Notes due January 2030 |  |  |  |
Derivatives |  |  |  |
Medium-term notes |  |  |  | $ 300,000
Designated as Hedging Instrument | Interest rate swaps |  |  |  |
Derivatives |  |  |  |
Number of Interest Rate Derivatives Held | item | 4 |  |  |
Notional | $ 315,000 |  |  |
Designated as Hedging Instrument | Interest rate swaps subsequently terminated and settled |  |  |  |
Derivatives |  |  |  |
Number of Interest Rate Derivatives Held | instrument | 2 |  |  |
Notional | $ 75,000 |  |  |
Not Designated as Hedging Instrument | Interest rate caps |  |  |  |
Derivatives |  |  |  |
Number of Interest Rate Derivatives Held | instrument | 1 |  |  |
Notional | $ 19,880 |  |  |

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