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Real Estate Investments - Dispositions (Textual) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) property | Dec. 31, 2016 USD ($) a property Parcel | Dec. 31, 2015 USD ($) a property Parcel | Dec. 31, 2014 USD ($) ft² a property Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  |  | 113 |  |
Impairment of properties held for use |  |  | $ 7,300,000 |  |
Aggregate carrying value |  |  | 25,800,000 |  |
Estimated Fair Value Of Impaired Property |  |  | $ 18,500,000 |  |
1000 Atrium Way [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  | 99,668
Libertyview [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Rentable Square Feet | ft² |  |  |  |  | 121,737
A 100 Atrium Way and Liberty View [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  |  |  |  | 2
Provision for impairment on assets held for sale |  |  |  |  | $ 0
Land [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Parcels | Parcel |  |  | 3 | 4 | 2
Acreage of land | a |  |  | 122.9 | 14.7 | 22.1
Other Segment [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  |  | 3 |  |
Impairment of properties held for use |  |  | $ 7,300,000 |  |
Carrying value of real estate prior to impairment |  |  | 25,800,000 |  |
Aggregate carrying value |  |  | $ 18,500,000 |  |
Impairment Hold Period |  |  | 10 years |  |
Residual Capitalization Rates |  |  | 8.75% |  |
Discount Rates |  |  | 9.00% |  |
Other Segment [Member] | Land [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Impairment of properties held for use |  |  | $ 5,600,000 |  |
Carrying value of real estate prior to impairment |  |  | 18,200,000 |  |
Aggregate carrying value |  |  | $ 12,600,000 |  |
Number of Parcels | Parcel |  |  | 5 |  |
Acreage of land | a |  |  | 108 |  |
Metropolitan DC [Member] |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |
Number of Properties | property |  | 2 |  | 3 |
Impairment of properties held for use | $ 3,900,000 | $ 7,400,000 |  | $ 27,500,000 |
Carrying value of real estate prior to impairment | 37,400,000 | 51,900,000 |  |  |
Aggregate carrying value | $ 33,500,000 | $ 44,500,000 |  | $ 40,400,000 |
Impairment Hold Period | 10 years | 10 years |  | 10 years |
Residual Capitalization Rates | 7.75% | 7.00% |  | 8.00% |
Discount Rates | 8.25% | 7.00% |  | 8.00% |
Estimated Fair Value Of Impaired Property |  |  |  | $ 12,900,000 |

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