Mortgage Loans Payable and Unsecured Credit Facilities (Schedule of Debt and Finance Lease Obligations Related to Continuing Operations) (Details) - USD ($)
|
12 Months Ended |
|
Dec. 31, 2021 |
Dec. 31, 2020 |
| Debt Instrument [Line Items] |
|
|
| Total debt gross |
$ 530,167,000
|
|
| Credit facilities |
66,000,000
|
$ 175,000,000
|
| Unamortized issuance costs |
(3,129,000)
|
(2,002,000)
|
| Total debt |
527,038,000
|
|
| Revolving Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Total debt gross |
66,000,000
|
|
| Credit facilities |
66,000,000.0
|
|
| Continuing Operations [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Total debt gross |
530,167,000
|
626,276,000
|
| Total debt |
$ 527,038,000
|
$ 624,274,000
|
| Weighted average contractual interest rate |
3.50%
|
3.40%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Total debt gross |
$ 164,167,000
|
$ 51,276,000
|
| Weighted average contractual interest rate |
3.60%
|
4.10%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Franklin Village [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2026
|
|
| Total debt gross |
$ 44,571,000
|
$ 45,645,000
|
| Weighted average contractual interest rate |
3.90%
|
3.90%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Shops at Suffolk Downs [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2031
|
|
| Total debt gross |
$ 15,600,000
|
|
| Weighted average contractual interest rate |
3.50%
|
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Trexlertown Plaza [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2031
|
|
| Total debt gross |
$ 36,100,000
|
|
| Weighted average contractual interest rate |
3.50%
|
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | The Point [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2031
|
|
| Total debt gross |
$ 29,700,000
|
|
| Weighted average contractual interest rate |
3.50%
|
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Christina Crossing [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2031
|
|
| Total debt gross |
$ 17,000,000
|
|
| Weighted average contractual interest rate |
3.50%
|
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Lawndale Plaza [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jun. 30, 2031
|
|
| Total debt gross |
$ 15,600,000
|
|
| Weighted average contractual interest rate |
3.50%
|
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Senator Square Finance Lease Obligation [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Sep. 30, 2050
|
|
| Total debt gross |
$ 5,596,000
|
$ 5,631,000
|
| Weighted average contractual interest rate |
5.30%
|
5.30%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Two [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Feb. 28, 2022
|
|
| Credit facilities |
|
$ 50,000,000
|
| Weighted average contractual interest rate |
|
3.30%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Three [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Apr. 30, 2023
|
|
| Credit facilities |
$ 100,000,000
|
$ 100,000,000
|
| Weighted average contractual interest rate |
3.30%
|
3.50%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Four [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Sep. 30, 2024
|
|
| Credit facilities |
$ 75,000,000
|
$ 75,000,000
|
| Weighted average contractual interest rate |
3.80%
|
3.90%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Five [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Jul. 31, 2025
|
|
| Credit facilities |
$ 75,000,000
|
$ 75,000,000
|
| Weighted average contractual interest rate |
4.70%
|
4.80%
|
| Continuing Operations [Member] | Fixed-Rate Mortgage [Member] | Term Loan Six [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Aug. 31, 2026
|
|
| Credit facilities |
$ 50,000,000
|
$ 50,000,000
|
| Weighted average contractual interest rate |
3.30%
|
3.50%
|
| Continuing Operations [Member] | Variable Rate Mortgage | Term Loan [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Sep. 30, 2022
|
|
| Credit facilities |
|
$ 50,000,000
|
| Weighted average contractual interest rate |
|
1.90%
|
| Continuing Operations [Member] | Variable Rate Mortgage | Revolving Credit Facility [Member] | Unsecured Credit Facility [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Maturity date |
Aug. 31, 2024
|
|
| Credit facilities |
$ 66,000,000
|
$ 175,000,000
|
| Weighted average contractual interest rate |
1.60%
|
2.70%
|