Financing Activity - Mortgage Loan Activity (Details) - USD ($) $ in Thousands	Dec. 10, 2021	Jun. 25, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage loans, carrying value			$ 851,283	$ 884,503
Francis Scott Key Mall | Mortgage Loan | Commercial Real Estate
Debt Instrument [Line Items]
Mortgage loans, carrying value		$ 60,500
Mortgage loans, maturity date		Jun. 25, 2024
Lender fees as additional debt issuance costs		$ 300
Francis Scott Key Mall | Mortgage Loan | Commercial Real Estate | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate		3.60%
Viewmont Mall | Mortgage Loan | Commercial Real Estate
Debt Instrument [Line Items]
Mortgage loans, carrying value		$ 67,200
Mortgage loans, maturity date		Jun. 25, 2024
Lender fees as additional debt issuance costs		$ 500
Viewmont Mall | Mortgage Loan | Commercial Real Estate | LIBOR
Debt Instrument [Line Items]
Debt, variable interest rate		3.60%
Woodland Amendment | Mortgage Loan | Commercial Real Estate
Debt Instrument [Line Items]
Mortgage loans, maturity date	Dec. 10, 2022
Lender fees as additional debt issuance costs					$ 300