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Real Estate (Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 06, 2017 | Feb. 22, 2017 | Feb. 01, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisitions of real estate |  |  |  |  | $ 32,442,000 | $ 31,928,000
Impairment charge |  |  |  | $ 6,270,000 | $ 9,850,000 | $ 6,270,000
Christina Crossing [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisitions of real estate |  | $ 27,900,000 |  |  |  |
South Philadelphia Shopping Center [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Acquisitions of real estate | $ 3,300,000 |  |  |  |  |
Camp Hill [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Sales price of real estate sold |  |  | $ 10,700,000 |  |  |
Gain on sale of real estate |  |  | $ 7,100,000 |  |  |

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- Definition The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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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. + Details
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- Definition Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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