Investment in Unconsolidated Joint Ventures (Crawford Long—CPI, LLC) (Details) ft² in Thousands, $ in Thousands	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Aggregate outstanding indebtedness	$ 338,590	$ 526,458
Crawford Long - CPI, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%
Square footage of real estate property (square feet) \| ft²	358
Aggregate outstanding indebtedness	$ 71,047	$ 72,822
Cash balance of joint venture	$ 1,600
Crawford Long - CPI, LLC \| Secured Mortgage Note Payable
Schedule of Equity Method Investments [Line Items]
Interest rate on mortgage loan (percent)	3.50%
Crawford Long - CPI, LLC \| Emory University
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%

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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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