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Real Estate (Schedule Of Transactions Related To Properties Held For Sale/Conveyance) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Real Estate Properties [Line Items] |  |  |  |
Gain on sale |  | $ 59,000 |  | $ 6,413,000
Upland Square [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Impairment charges on sale of property |  | 6,300,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Sales Price |  | $ 98,250,000 | $ 4,075,000 | 53,325,000
Gain on sale |  |  |  | $ 6,413,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Blue Mountain Commons Land Parcel [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Oct. 22, 2014
Sales Price |  |  |  | $ 350,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Liberty Marketplace [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  | Feb. 11, 2016 |  |
Sales Price |  | $ 15,000,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Upland Square [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  | Nov. 02, 2016 |  |
Sales Price | [1] | $ 83,250,000 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kenley Village [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  | May 28, 2015 |
Sales Price |  |  | $ 2,275,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Circle Plaza [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  | Jul. 22, 2015 |
Sales Price |  |  | $ 1,800,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Fairview Plaza [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | May 27, 2014
Sales Price |  |  |  | $ 12,450,000
Gain on sale |  |  |  | $ 3,810,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Carbondale Plaza [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Jul. 18, 2014
Sales Price |  |  |  | $ 10,700,000
Gain on sale |  |  |  | $ 123,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Virginia Little Creek [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Aug. 22, 2014
Sales Price |  |  |  | $ 9,850,000
Gain on sale |  |  |  | $ 2,209,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Annie Land Plaza [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Sep. 26, 2014
Sales Price |  |  |  | $ 3,500,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Smithfield Plaza [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Oct. 21, 2014
Sales Price |  |  |  | $ 12,350,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | St. James Square [Member] |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Date Sold |  |  |  | Nov. 05, 2014
Sales Price |  |  |  | $ 4,125,000
Gain on sale |  |  |  | $ 271,000
[1] | The company recorded a $6.3 million impairment charge in connection with the sale of this property

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- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + 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 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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