Investment in Unconsolidated Joint Ventures Carolina Square (Details) - Carolina Square Holdings LP [Member] $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Method Investments Summarized Financial Information Cash	$ 0.1
General Partners' Contributed Capital	1.7
Maximum Amount Available Under Construction Facility Revised	$ 79.8
Debt Instrument, Basis Spread on Variable Rate	1.90%
Mortgage Loans on Real Estate, Final Maturity Date	May 01, 2018
Maximum Percentage Guaranteed Under Construction Loan	12.50%
NR 123 Franklin LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Percentage of Partner in Joint Venture	5000.00%
LIBOR [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Description of Variable Rate Basis	LIBOR

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
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