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Real Estate - Summary of Property Dispositions (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2020 USD ($)
Real Estate Properties [Line Items]
Gain on Sale/Reversal of Impairment	$ 679,000	$ 49,904,000	$ 679,000
Discontinued Operations, Disposed of by Sale [Member]
Real Estate Properties [Line Items]
GLA | ft²		633,507
Sales Price		$ 100,723,500
Gain on Sale/Reversal of Impairment		$ 51,753,000
Discontinued Operations, Disposed of by Sale [Member] | Kempsville Crossing (Land Parcel) [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
Discontinued Operations, Disposed of by Sale [Member] | The Commons [Member]
Real Estate Properties [Line Items]
Location		Dubois, PA
GLA | ft²		203,309
Date Sold		May 05, 2021
Sales Price		$ 9,761,000
Gain on Sale/Reversal of Impairment		$ 1,849,000
Discontinued Operations, Disposed of by Sale [Member] | Camp Hill Shopping Center [Member]
Real Estate Properties [Line Items]
Location		Camp Hill, PA
GLA | ft²		430,198
Date Sold		Jun. 21, 2021
Sales Price		$ 89,662,500
Gain on Sale/Reversal of Impairment		$ 48,857,000

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- Definition

Date of real estate property sold.

+ References

No definition available.

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- Definition

Real estate dispositions sales price.

+ References

No definition available.

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- Definition

Real estate sold properties location.

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

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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

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- Definition

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.

+ References

No definition available.

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