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Derivative Financial Instruments - Risk Management and Unsecured Loan Swaps (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Interest Rate Swaps
Unsecured Term Loan Swaps
Notional amount liabilities	$ 325,000	$ 825,000
Notional amount assets	950,000	$ 600,000
Interest Rate Derivative, Wells Fargo Bank, March 20, 2015
Unsecured Term Loan Swaps
Derivative Liability, Fair Value, Gross Liability	$ 0
Fixed Interest Rate (as a percent)	1.828%
Derivative, Notional Amount	$ 25,000
Interest Rate Derivative, The Toronto-Dominion Bank, February 14, 2020
Unsecured Term Loan Swaps
Derivative Liability, Fair Value, Gross Liability	$ 0
Fixed Interest Rate (as a percent)	2.4535%
Derivative, Notional Amount	$ 25,000
Interest Rate Derivative, Regions Bank, February 14, 2020
Unsecured Term Loan Swaps
Derivative Liability, Fair Value, Gross Liability	$ 0
Fixed Interest Rate (as a percent)	2.475%
Derivative, Notional Amount	$ 50,000
Interest Rate Derivative, Capital One, February 14, 2020
Unsecured Term Loan Swaps
Derivative Liability, Fair Value, Gross Liability	$ 0
Fixed Interest Rate (as a percent)	2.53%
Derivative, Notional Amount	$ 50,000
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	$ (64)
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	$ (63)
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	$ (63)
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	$ (63)
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	$ (126)
Fixed Interest Rate (as a percent)	1.8475%
Interest Rate Derivative, TD Bank, $75m, Sep 29, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 1,223
Fixed Interest Rate (as a percent)	0.275%
Interest Rate Derivative, Wells Fargo Bank, $75m, Sep 29, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 1,219
Fixed Interest Rate (as a percent)	0.279%
Interest Rate Derivative, TD Bank, $75m, March 19, 2021
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 1,223
Fixed Interest Rate (as a percent)	0.275%
Interest Rate Derivative, Wells Fargo Bank, $75m, March 19, 2021
Unsecured Term Loan Swaps
Notional amount assets	$ 75,000
Derivative Asset, Fair Value, Gross Asset	$ 1,218
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	$ (548)
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	$ (549)
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	$ (548)
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	$ (274)
Fixed Interest Rate (as a percent)	2.919%
Interest Rate Derivative, Wells Fargo Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 280
Fixed Interest Rate (as a percent)	2.246%
Interest Rate Derivative, US Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 284
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Regions Bank, July 15, 2020 [Member]
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 280
Fixed Interest Rate (as a percent)	2.2459%
Interest Rate Derivative, Bank of Montreal, July 15, 2020
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 1,008
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	$ 6,853
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	$ 3,409
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	$ 3,419
Fixed Interest Rate (as a percent)	0.936%
Interest Rate Derivative, Regions Bank, April 1, 2022
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 2,419
Fixed Interest Rate (as a percent)	1.3045%
Interest Rate Derivative, Ban of Montreal, April 1, 2022
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 2,438
Fixed Interest Rate (as a percent)	1.3045%
Interest Rate Derivative, PNC Bank, April 1, 2022
Unsecured Term Loan Swaps
Notional amount assets	$ 50,000
Derivative Asset, Fair Value, Gross Asset	$ 2,423
Fixed Interest Rate (as a percent)	1.3045%

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