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Investment in Real Estate - Summary of Property Sold (Details) $ in Millions					6 Months Ended
	Jun. 01, 2016 USD ($) ft² building	Apr. 07, 2016 USD ($) ft² building	Jan. 14, 2016 USD ($) ft² building	Mar. 06, 2015 USD ($) ft² building	Jun. 30, 2016 USD ($) ft² building	Jun. 30, 2015 USD ($) ft² building	Jan. 05, 2015
Real Estate [Line Items]
Number of real estate properties acquired | building					6	1
Area of real estate property (in square feet) | ft²					820,587	223,679
Proceeds from sale of real estate | $					$ 287.4	$ 89.0
Location 1455 Market Street [Member]
Real Estate [Line Items]
Real estate property, ownership percentage							45.00%
Bayhill
Real Estate [Line Items]
Number of real estate properties acquired | building			4
Area of real estate property (in square feet) | ft²			554,328
Proceeds from sale of real estate | $			$ 215.0
Patrick Henry Office Property
Real Estate [Line Items]
Number of real estate properties acquired | building		1
Area of real estate property (in square feet) | ft²		70,520
Proceeds from sale of real estate | $		$ 19.0
One Bay Plaza
Real Estate [Line Items]
Number of real estate properties acquired | building	1
Area of real estate property (in square feet) | ft²	195,739
Proceeds from sale of real estate | $	$ 53.4
First Financial
Real Estate [Line Items]
Number of real estate properties acquired | building				1
Area of real estate property (in square feet) | ft²				223,679
Proceeds from sale of real estate | $				$ 89.0

X

- Definition

Represents the gross sales price before certain credits, prorations and closing costs of dispositions during the reporting period.

+ References

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- Definition

Number Of Real Estate Properties Acquired

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- Definition

Area of a real estate property.

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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=66011266&loc=d3e33918-111571

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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