Investment in Unconsolidated Joint Ventures (Charlotte Gateway Village, LLC) (Details) ft² in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) ft²
Schedule of Equity Method Investments [Line Items]
Outstanding Amount of Mortgage Note Payable of Joint Venture	$ 402.0
Charlotte Gateway Village LLC [Member]
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property (square feet) | ft²	1.1
Percentage of real estate property leased (percent)	100.00%
Lease Expiration Date	Dec. 31, 2026
Compounded rate of return received by Company (percent)	11.46%
Percentage of Company's income (loss) received in final step of distribution	0.5
Maximum IRR on project (percent)	17.00%
Cash balance of joint venture	$ 2.3
Charlotte Gateway Village LLC [Member] | Secured Mortgage Note Payable [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding Amount of Mortgage Note Payable of Joint Venture	$ 17.5
Maturity date of debt instrument	Dec. 01, 2016
Interest rate on mortgage loan (percent)	6.41%
Bank of America Corporation [Member] | Charlotte Gateway Village LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage of Partner in Joint Venture	5000.00%