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Real Estate (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Real Estate Properties [Line Items] |  |  |
Impairment charges | $ 9,850,000 | $ 21,396,000 | $ 9,850,000
Carll's Corner [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  | Bridgeton, New Jersey |
Maxatawny Marketplace [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  | Maxatawny, Pennsylvania |
West Bridgewater Plaza [Member] |  |  |
Real Estate Properties [Line Items] |  |  |
Location |  | West Bridgewater, Massachusetts |

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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/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=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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- Details
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- Details
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- Details
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