Investment in Unconsolidated Joint Ventures (Carolina Square Holdings LP) (Details) - Carolina Square Holdings LP $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%
Maximum percentage guaranteed under construction loan	12.50%
Outstanding balance of mortgage loan	$ 64.4
Cash balance of joint venture	$ 1.5
LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate (percent)	1.90%
Northwood Ravin
Schedule of Equity Method Investments [Line Items]
Ownership percentage of partner in joint venture	50.00%

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The carrying amount of the outstanding balance due under the mortgage loan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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