Real Estate (Schedule of Transactions Related to Properties Held for Sale/Conveyance) (Details) - USD ($)
|
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Real Estate Properties [Line Items] |
|
|
|
| Gain on Sale/Reversal of Impairment |
$ 49,904,000
|
$ 4,396,000
|
$ 2,942,000
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Sales Price |
100,723,500
|
21,928,000
|
19,378,000
|
| Gain on Sale/Reversal of Impairment |
$ 51,753,000
|
$ 4,396,000
|
$ 2,942,000
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Metro Square [Member] |
|
|
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| Real Estate Properties [Line Items] |
|
|
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| Location |
|
Owings Mills, MD
|
|
| Date Sold |
|
Jul. 09, 2020
|
|
| Sales Price |
|
$ 4,288,000
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Maxatawny Marketplace [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
|
Maxatawny, PA
|
| Date Sold |
|
|
Feb. 15, 2019
|
| Sales Price |
|
|
$ 10,330,000
|
| Gain on Sale/Reversal of Impairment |
|
|
$ 101,000
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kempsville Crossing [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
Virginia Beach, VA
|
|
|
| Date Sold |
Feb. 24, 2021
|
|
|
| Sales Price |
$ 1,300,000
|
|
|
| Gain on Sale/Reversal of Impairment |
$ 1,047,000
|
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Oakland Mills Outparcel Building [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
Columbia, MD
|
|
| Date Sold |
|
Sep. 17, 2020
|
|
| Sales Price |
|
$ 1,050,000
|
|
| Gain on Sale/Reversal of Impairment |
|
$ 643,000
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Fort Washington Center [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
|
Fort Washington, PA
|
| Date Sold |
|
|
Jun. 26, 2019
|
| Sales Price |
|
|
$ 9,048,000
|
| Gain on Sale/Reversal of Impairment |
|
|
$ 2,841,000
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | The Commons [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
Dubois, PA
|
|
|
| Date Sold |
May 05, 2021
|
|
|
| Sales Price |
$ 9,761,000
|
|
|
| Gain on Sale/Reversal of Impairment |
$ 1,849,000
|
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Glen Allen Shopping Center [Member] |
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|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
Glen Allen, VA
|
|
| Date Sold |
|
Oct. 08, 2020
|
|
| Sales Price |
|
$ 8,540,000
|
|
| Gain on Sale/Reversal of Impairment |
|
$ 1,780,000
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Camp Hill Shopping Center [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
Camp Hill, PA
|
|
|
| Date Sold |
Jun. 21, 2021
|
|
|
| Sales Price |
$ 89,662,500
|
|
|
| Gain on Sale/Reversal of Impairment |
$ 48,857,000
|
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Pine Grove Plaza Outparcel Building [Member] |
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
Brown Mills, NJ
|
|
| Date Sold |
|
Nov. 02, 2020
|
|
| Sales Price |
|
$ 1,100,000
|
|
| Gain on Sale/Reversal of Impairment |
|
$ 565,000
|
|
| Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Suffolk Plaza [Member] |
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|
|
| Real Estate Properties [Line Items] |
|
|
|
| Location |
|
Suffolk, VA
|
|
| Date Sold |
|
Dec. 10, 2020
|
|
| Sales Price |
|
$ 6,950,000
|
|
| Gain on Sale/Reversal of Impairment |
|
$ 1,408,000
|
|