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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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