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Subsequent Events subsequent Events (Details) - Subsequent Event [Member] $ in Millions | Jul. 01, 2016 USD ($) ft² a Buildings Vehicles | Jul. 29, 2016 USD ($)
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Colorado Center [Member] | Colorado Center [Member] |  |
Subsequent Event [Line Items] |  |
number of buildings | Buildings | 6 |
Land acquired (in acres) | a | 15 |
Ownership Percentage | 49.80% |
Net Rentable Area (in sf) | ft² | 1,184,000 |
Purchase price | $ 511.1 |
Purchase price, net | $ 503.6 |
Portion of Building Leased (percentage) | 68.00% |
Vehicles In Structured Parking | Vehicles | 3,100 |
Broad Run Business Park [Member] |  |
Subsequent Event [Line Items] |  |
Sale Price Of Sold Property |  | $ 18.0

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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