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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] |  |  |
Real Estate Properties [Line Items] |  |  |
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] |  |  |
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] |  |  |
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 |

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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