Debt - Mortgages (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal Balance	$ 946,388	$ 1,030,254
Unamortized premium	475	1,103
Total notes payable, net	943,828	1,027,751
Mortgages
Debt Instrument [Line Items]
Principal Balance	$ 83,388	$ 85,254
Weighted average interest rate	5.06%	5.06%
Unamortized premium	$ 475	$ 1,103
Total notes payable, net	83,863	86,357
Mortgages \| Bridgewater Falls Shopping Center
Debt Instrument [Line Items]
Principal Balance	$ 51,365	$ 52,274
Interest Rate	5.70%	5.70%
Mortgages \| The Shops on Lane Avenue
Debt Instrument [Line Items]
Principal Balance	$ 27,762	$ 28,169
Interest Rate	3.76%	3.76%
Mortgages \| Nagawaukee II
Debt Instrument [Line Items]
Principal Balance	$ 4,261	$ 4,811
Interest Rate	5.80%	5.80%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt premium.

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- Definition

Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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