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Real Estate Investments - Dispositions (Textual) (Details) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 19, 2016 USD ($) Parcel | Sep. 30, 2016 USD ($) property | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) property | Sep. 30, 2015 USD ($) | Jan. 15, 2016 USD ($) Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale |  | $ (104,000) |  |  |  | $ 6,083,000 | $ 114,625,000 | $ 16,673,000 |
Number of Properties | property |  | 117 |  |  |  |  | 117 |  |
Held for Sale Properties Included in Continuing Operations [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  |  |  |  |  | $ 0 |  |
Number of Properties | property |  | 4 |  |  |  |  | 4 |  |
Mt.Laurel, New Jersey [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Parcels | Parcel | 2 |  |  |  |  |  |  |  |
Sales Price | $ 300,000 |  |  |  |  |  |  |  |
Proceeds from sale of land | 300,000 |  |  |  |  |  |  |  |
Gain (Loss) on Sale | $ 200,000 |  |  |  |  |  |  |  |
Pennsylvania Suburbs [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  |  |  |  |  |  | 120
Sales Price |  |  |  |  |  |  |  |  | $ 900,000
Gain (Loss) on Sale |  |  |  |  |  |  | $ 0 |  |
Provision for impairment on assets held for sale |  |  |  |  | $ 300,000 |  |  |  |
Metropolitan DC [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Impairment of properties held for use |  | $ 0 | $ 3,900,000 | $ 7,400,000 |  |  |  |  |
Carrying value of real estate prior to impairment |  |  | 37,400,000 | 51,900,000 |  |  |  |  |
Aggregate carrying value |  |  | $ 33,500,000 | $ 44,500,000 |  |  |  |  |
Impairment Hold Period |  |  | 10 years | 10 years |  |  |  |  |
Residual Capitalization Rates |  |  | 7.75% | 7.00% |  |  |  |  |
Discount Rates |  |  | 8.25% | 7.00% |  |  |  |  |
Number of Properties | property |  |  |  | 2 |  |  |  |  |

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230 + Details
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