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Real Estate Investments - Dispositions (Textual) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jan. 15, 2015 USD ($) Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Gain (Loss) on Sale | $ 115,456,000 |  | $ 9,019,000 |
Number of Properties | property | 121 |  |  |
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
Provision for impairment on assets held for sale |  | $ 300,000 |  |
Gain (Loss) on Sale | $ 0 |  |  |
Metropolitan DC [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties | property | 2 |  |  |
Impairment of properties held for use | $ 7,400,000 |  |  |
Carrying value of real estate prior to impairment | 51,900,000 |  |  |
Aggregate carrying value | $ 44,500,000 |  |  |
Impairment Hold Period | 10 years |  |  |
Residual Capitalization Rates | 7.00% |  |  |
Discount Rates | 7.00% |  |  |

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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=51824106&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=51719941&loc=d3e2941-110230 + Details
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