Debt and Derivative Instruments (Schedule of Mortgages and Credit Facility Payable) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Mortgage Loans On Real Estate [Line Items]
Mortgages payable	$ 138,184	$ 179,693
Credit facility payable	713,000	677,000
Total debt before unamortized debt issuance costs including impact of interest rate swaps	851,184	856,693
Less: Unamortized debt issuance costs	(3,727)	(4,348)
Total debt	$ 847,457	$ 852,345
Mortgages Payable, Weighted Average Interest Rate	3.97%	3.79%
Credit Facilities Payable, Weighted Average Interest Rate	4.92%	4.56%
Total debt before unamortized debt issuance costs including impact of interest rate swaps, Weighted Average Interest Rate	4.76%	4.40%
Fixed rate mortgages payable [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgages payable	$ 112,184	$ 112,345
Mortgages Payable, Weighted Average Interest Rate	3.84%	3.84%
Variable rate mortgages payable with swap agreements [Member]
Mortgage Loans On Real Estate [Line Items]
Mortgages payable	$ 26,000	$ 67,348
Mortgages Payable, Weighted Average Interest Rate	4.55%	3.71%