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Fair Value Measurements and Interest Rate Swaps - Interest Rate Swap (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Unsecured Term Loan Due October 2023 | Unsecured term loan |  |
Derivative [Line Items] |  |
Principal balance | $ 50,000,000 |
Unsecured Term Loan Due July 2024 | Unsecured term loan |  |
Derivative [Line Items] |  |
Principal balance | 350,000,000 |
Interest Rate Swap |  |
Derivative [Line Items] |  |
Fair Value of Assets (Liabilities) | $ (2,545,000) | $ 0
Interest Rate Swap | Unsecured Term Loan Due October 2023 |  |
Derivative [Line Items] |  |
Rate Fixed | 2.41% |
Notional Amount | $ 50,000 |
Fair Value of Assets (Liabilities) | $ (1,597,000) | 0
Interest Rate Swap | Unsecured Term Loan Due July 2024 |  |
Derivative [Line Items] |  |
Rate Fixed | 1.70% |
Notional Amount | $ 175,000 |
Fair Value of Assets (Liabilities) | $ (948,000) | $ 0

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