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Subsequent Events subsequent Events (Details) - Subsequent Event [Member] $ in Millions	Jul. 01, 2016 USD ($) ft² a Buildings Vehicles	Jul. 29, 2016 USD ($)
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

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Land acquired (in acres)

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Vehicles In Structured Parking

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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

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- Definition

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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