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Subsequent Events (Textual) (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 17, 2018 USD ($) ft² property | Oct. 16, 2018 USD ($) ft² property | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2018 USD ($) ft² | Sep. 30, 2017
Subsequent Event [Line Items] |  |  |  |  |
Net Rentable Square Feet | ft² |  |  | 16,462,764 | 16,462,764 |
DRA Austin Venture [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  |  | 50.00% | 50.00% | 50.00%
Investment in real estate venture |  |  | $ 14.4 | $ 14.4 |
Held for Sale Properties Included in Continuing Operations [Member] | Metropolitan Washington, D.C. - Office [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Impairment on assets held for sale |  |  | $ 56.9 |  |
Subsequent Event [Member] | DRA Austin Venture [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Net Rentable Square Feet | ft² | 1,570,123 |  |  |  |
Percentage of ownership interest to be acquired | 50.00% |  |  |  |
Number of real estate property to be acquired | property | 12 |  |  |  |
Purchase price to be transferred to acquire real estate properties | $ 537.0 |  |  |  |
Mortgage debt to be assumed in connection with acquisition of real estate properties | $ 245.8 |  |  |  |
Subsequent Event [Member] | Held for Sale Properties Included in Continuing Operations [Member] | Metropolitan Washington, D.C. - Office [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of properties to be sold | property |  | 8 |  |  |
Net Rentable Square Feet | ft² |  | 1,293,197 |  |  |
Sales Price |  | $ 312.0 |  |  |
Equity method investment, ownership percentage |  | 15.00% |  |  |
Net proceeds received from real estate venture transactions |  | $ 292.0 |  |  |
Impairment on assets held for sale |  |  |  | $ 56.9 |

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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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