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Summary of Significant Accounting Policies - Consolidated Entities (Details) - VIE, Primary Beneficiary	9 Months Ended
	Sep. 30, 2017
Pinnacle I
Variable Interest Entity [Line Items]
Ownership interest	65.00%
Pinnacle II
Variable Interest Entity [Line Items]
Ownership interest	65.00%
1455 Market Street
Variable Interest Entity [Line Items]
Ownership interest	55.00%
Hill7
Variable Interest Entity [Line Items]
Ownership interest	55.00%

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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.

+ References

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685

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