Mortgage Loans Payable and Credit Facilities (Narrative) (Details)						6 Months Ended	12 Months Ended
	Dec. 21, 2022 USD ($) PropertyPortfolio	Oct. 28, 2022 USD ($) PropertyPortfolio	Aug. 22, 2022 USD ($) PropertyPortfolio	Aug. 30, 2021 USD ($) Term	May 05, 2021 USD ($)	Jun. 30, 2022	Dec. 31, 2022 USD ($) PropertyPortfolio Term	Dec. 31, 2021 USD ($)
Line Of Credit Facility [Line Items]
Number of properties collateralize by secured term loans | PropertyPortfolio							12
Credit facilities								$ 66,000,000
Interest rate swaps liability							$ 0
Interest Rate Swap [Member]
Line Of Credit Facility [Line Items]
Derivative, notional amount								$ 300,000,000.0
Non-recourse Mortgage [Member]
Line Of Credit Facility [Line Items]
Maturity date					Jun. 01, 2031
Interest at fixed-rate					3.49%
Non-recourse Mortgage [Member] | Nonrecourse [Member]
Line Of Credit Facility [Line Items]
Non-recourse mortgage debt					$ 114,000,000.0
KeyBank Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Number of property portfolio | PropertyPortfolio			19
Term loan amount			$ 130,000,000.0
Guggenheim Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Number of property portfolio | PropertyPortfolio		10
Credit facilities		$ 110,000,000.0
Maturity date		Nov. 10, 2032
Interest at fixed-rate		5.25%
Citi Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Number of property portfolio | PropertyPortfolio	2
Credit facilities	$ 25,000,000.0
Maturity date	Jan. 06, 2033
Interest at fixed-rate	6.35%
Unsecured Credit Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility borrowing capacity				$ 300,000,000
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line of credit facility extension allowed term | Term							2
Line of credit facility extension allowed period							1 year
Basis spread on borrowings variable rate						1.50%
Revolving Credit Facility [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Basis spread on borrowings variable rate				1.35%
Revolving Credit Facility [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Basis spread on borrowings variable rate				1.95%
Revolving Credit Facility [Member] | Unsecured Credit Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility borrowing capacity				$ 185,000,000
Credit facility expiration date				Aug. 31, 2024
Line of credit facility extension allowed term | Term				2
Line of credit facility extension allowed period				1 year
Term loan facility [Member] | Unsecured Credit Facility [Member]
Line Of Credit Facility [Line Items]
Credit facility borrowing capacity				$ 50,000,000
Credit facility expiration date				Aug. 31, 2026
Line of credit facility extension allowed period				4 years
Term Loan [Member] | KeyBank Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Variable rate description							Secured Overnight Financing Rate plus 0.10% plus an applicable margin of 2.5% through February 2023
Applicable margin			2.50%
Increase in applicable margin			4.00%
Interest rate description							The interest rate on this term loan consisted of the term Secured Overnight Financing Rate plus 0.10% plus an applicable margin of 2.5% through February 2023, at which time increases to 4.0%
Term Loan [Member] | KeyBank Credit Agreement [Member] | Secured Overnight Financing Rate [Member]
Line Of Credit Facility [Line Items]
Basis spread on borrowings variable rate			0.10%
Interest Expense, Net [Member] | Discontinued Operations [Member] | Interest Rate Swap [Member]
Line Of Credit Facility [Line Items]
Interest rate swaps termination benefit							$ 3,400,000