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Subsequent Events (Details)		9 Months Ended
	Oct. 07, 2016 USD ($) ft²	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($) ft²
Subsequent Event [Line Items]
Area of real estate property (in square feet) | ft²		820,587	483,862
Payments to purchase office building		$ 307,919,000	$ 1,804,596,000
Subsequent Event | Hill7 Office Development | Secured Debt
Subsequent Event [Line Items]
Face amount	$ 101,000,000.0
Debt instrument, stated interest rate (as a percent)	3.38%
Debt instrument term	10 years
Debt instrument, extension period	2 years
Subsequent Event | Hill7 Office Development
Subsequent Event [Line Items]
Area of real estate property (in square feet) | ft²	285,680
Payments to purchase office building	$ 179,800,000

X

- Definition

Debt Instrument, Extension Period

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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- Definition

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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No definition available.

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