Investment in Unconsolidated Joint Ventures (Crawford Long—CPI, LLC) (Details) ft² in Thousands, $ in Thousands	Dec. 31, 2018 USD ($) ft²	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Aggregate outstanding indebtedness	$ 342,892	$ 338,590
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	$ 69,522	$ 71,047
Cash balance of joint venture	$ 2,100
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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