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Discontinued Operations (Details Textuals) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Apr. 07, 2014 Princeton Pike Corporate Center [Member] | Feb. 25, 2014 Princeton Pike Corporate Center [Member] | Sep. 30, 2013 Discontinued Operations [Member] | Sep. 30, 2013 Discontinued Operations [Member] | Dec. 31, 2013 Discontinued Operations [Member] Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Net gain on disposition of discontinued operations | $ (3) | $ (16) | $ 900 | $ 3,029 | $ 900 | $ 5,300 | $ (16) | $ 3,029 |
Number of properties sold |  |  |  |  |  |  |  |  | 14

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- Definition Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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