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Real Estate Acquisitions and Dispositions (Details) - Weighted-average amortization	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Acquired In-place Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible leases, weighted average useful life	13 years	11 years
Acquired Above-market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible leases, weighted average useful life	6 years	6 years
Acquired Below-market Leases
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible leases, weighted average useful life	18 years	19 years

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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