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Subsequent Events (Details) - USD ($) $ in Millions				12 Months Ended
	Feb. 12, 2018	Jan. 30, 2018	Jan. 23, 2018	Dec. 31, 2017	Jan. 31, 2018	Jan. 25, 2018
Subsequent Event [Line Items]
Proceeds from disposition of real estate held-for-sale				$ 254.8
Performance period (in years)				3 years
Embarcadero Place
Subsequent Event [Line Items]
Proceeds from disposition of real estate held-for-sale				$ 136.0
2600 Campus Drive
Subsequent Event [Line Items]
Proceeds from disposition of real estate held-for-sale				$ 22.5
Subsequent Event | Outperformance Program 2018
Subsequent Event [Line Items]
Maximum bonus pool	$ 25.0
TSR, absolute hurdle rate	7.00%
TSR, absolute hurdle rate, percent of performance in excess of hurdle rate	3.00%
TSR, percent in excess of SNL US office REIT index	3.00%
TSR, Percent of underperformance under SNL US office REIT index	3.00%
TSR, Percent of underperformance under SNL US office REIT index, threshold	3.00%
Target bonus pool	$ 4.8
TSR, Maximum bonus pool, percent of simple annual TSR	8.00%
Performance period (in years)	3 years
Mandatory holding period upon vesting	2 years
Subsequent Event | Outperformance Program 2018 | Maximum
Subsequent Event [Line Items]
TSR, linear reduction in absolute TSR performance	100.00%
TSR, linear reduction in simple annual TSR performance	7.00%
Subsequent Event | Outperformance Program 2018 | Minimum
Subsequent Event [Line Items]
TSR, linear reduction in absolute TSR performance	25.00%
TSR, linear reduction in simple annual TSR performance	0.00%
Subsequent Event | Outperformance Program 2018 | Victor J. Coleman
Subsequent Event [Line Items]
TSR, award percentage	24.00%
Subsequent Event | Outperformance Program 2018 | Mark T. Lammas
Subsequent Event [Line Items]
TSR, award percentage	13.75%
Subsequent Event | Outperformance Program 2018 | Christopher Barton
Subsequent Event [Line Items]
TSR, award percentage	6.40%
Subsequent Event | Outperformance Program 2018 | Alex Vouvalides
Subsequent Event [Line Items]
TSR, award percentage	9.15%
Subsequent Event | Outperformance Program 2018 | Josh Hatfield
Subsequent Event [Line Items]
TSR, award percentage	6.40%
Subsequent Event | Embarcadero Place
Subsequent Event [Line Items]
Proceeds from disposition of real estate held-for-sale						$ 136.0
Subsequent Event | 2600 Campus Drive
Subsequent Event [Line Items]
Proceeds from disposition of real estate held-for-sale					$ 22.5
Subsequent Event | Unsecured Revolving Credit Facility
Subsequent Event [Line Items]
Proceeds from lines of credit		$ 100.0	$ 100.0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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