Mortgage Loans Payable and Unsecured Credit Facility (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Parenthetical) (Details)		3 Months Ended	6 Months Ended
	Aug. 04, 2020	Sep. 30, 2021	Jun. 30, 2021
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate			1.65%
Line of credit facility extension allowed period	1 year		1 year
Unsecured Credit Facility [Member] | Scenario Forecast [Member]
Debt Instrument [Line Items]
Basis spread on borrowings variable rate		0.15%