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Derivative Financial Instruments - Risk Management and Unsecured Loan Swaps (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Interest Rate Swaps
Unsecured Term Loan Swaps
Notional amount liabilities	$ 975,000	$ 1,125,000
Notional amount assets	300,000	$ 0
Interest Rate Derivative, Wells Fargo Bank, March 20, 2015
Unsecured Term Loan Swaps
Notional amount liabilities	25,000
Derivative Liability, Fair Value, Gross Liability	$ (324)
Fixed Interest Rate (as a percent)	1.828%
Interest Rate Derivative, The Toronto-Dominion Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (441)
Fixed Interest Rate (as a percent)	2.4535%
Interest Rate Derivative, Regions Bank, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (891)
Fixed Interest Rate (as a percent)	2.475%
Interest Rate Derivative, Capital One, February 14, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (912)
Fixed Interest Rate (as a percent)	2.53%
Interest Rate Derivative, The Toronto-Dominion Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (637)
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, Royal Bank of Canada, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (638)
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, Wells Fargo Bank, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (638)
Fixed Interest Rate (as a percent)	1.8505%
Interest Rate Derivative, PNC Bank, $25m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (637)
Fixed Interest Rate (as a percent)	1.8485%
Interest Rate Derivative, PNC Bank, $50m, October 30, 2017
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,273)
Fixed Interest Rate (as a percent)	1.8475%
Interest Rate Derivative, TD Bank, $75m, Sep 29, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 75,000
Derivative Liability, Fair Value, Gross Liability	$ (64)
Fixed Interest Rate (as a percent)	0.275%
Interest Rate Derivative, Wells Fargo Bank, $75m, Sep 29, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 75,000
Derivative Liability, Fair Value, Gross Liability	$ (70)
Fixed Interest Rate (as a percent)	0.279%
Interest Rate Derivative, TD Bank, $75m, March 19, 2021
Unsecured Term Loan Swaps
Notional amount liabilities	$ 75,000
Derivative Liability, Fair Value, Gross Liability	$ (64)
Fixed Interest Rate (as a percent)	0.275%
Interest Rate Derivative, Wells Fargo Bank, $75m, March 19, 2021
Unsecured Term Loan Swaps
Notional amount liabilities	$ 75,000
Derivative Liability, Fair Value, Gross Liability	$ (71)
Fixed Interest Rate (as a percent)	0.28%
Interest Rate Derivative, The Toronto-Dominion Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,243)
Fixed Interest Rate (as a percent)	2.918%
Interest Rate Derivative, PNC Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,243)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Bank of Montreal, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (3,243)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, US Bank, July 26, 2019 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 25,000
Derivative Liability, Fair Value, Gross Liability	$ (1,622)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Wells Fargo Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,932)
Fixed Interest Rate (as a percent)	2.246%
Interest Rate Derivative, US Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,932)
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Regions Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (2,930)
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Bank of Montreal, July 15, 2020
Unsecured Term Loan Swaps
Notional amount liabilities	$ 50,000
Derivative Liability, Fair Value, Gross Liability	$ (1,990)
Fixed Interest Rate (as a percent)	1.7165%
Interest Rate Derivative, US Bank N.A, April 18, 2023
Unsecured Term Loan Swaps
Notional amount assets	$ 150,000
Derivative Asset, Fair Value, Gross Asset	$ 848
Fixed Interest Rate (as a percent)	0.9385%
Interest Rate Derivative, Wells Fargo Bank, April 18, 2021
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 428
Fixed Interest Rate (as a percent)	0.9365%
Interest Rate Derivative, The Toronto-Dominion Bank, April 18, 2023
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 428
Fixed Interest Rate (as a percent)	0.936%

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