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Basis of Presentation (Details) $ in Thousands	1 Months Ended
	Mar. 31, 2017 building property	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of properties included in joint venture agreement | property	1
Number of buildings included in joint venture agreement | building	2
Variable interest entity, consolidated, carrying amount, assets		$ 1,070,402	$ 1,102,986
Variable interest entity, consolidated, carrying amount, liabilities		$ 714,635	$ 720,678

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- Definition

Number of Buildings Included in Joint Venture Agreement

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- Definition

Number of Properties Included in Joint Venture Agreement

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5710-111685

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