Investment in Unconsolidated Joint Ventures (EP I LLC) (Details) - EP I LLC $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	75.00%
Maximum amount available under construction facility	$ 59,000
Cash balance of joint venture	$ 234
LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate (percent)	1.75%
Gables
Schedule of Equity Method Investments [Line Items]
Ownership interest percentage	25.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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