Investment in Unconsolidated Joint Ventures (Austin 300 Colorado Project, LP) (Details) - Austin 300 Colorado Project, LP ft² in Thousands, $ in Millions	1 Months Ended
Feb. 07, 2018 USD ($)	Dec. 31, 2017 ft²
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet) \| ft²		309
Ownership interest percentage		50.00%
Subsequent Event
Schedule of Equity Method Investments [Line Items]
Cash contributions to joint venture \| $	$ 6.0
3CB
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage		34.50%
3CRR
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage		15.50%

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

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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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

No definition available.

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