Investment in Unconsolidated Joint Ventures (Austin 300 Colorado Project, LP) (Details) - Austin 300 Colorado Project, LP ft² in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($) ft²
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet) \| ft²	358
Ownership interest percentage	50.00%
Cash contributions to joint venture	$ 6.0
Cash balance of joint venture	$ 1.7
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%

Equity method investments summarized financial information cash.

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Area of a real estate property.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 50
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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