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Real Estate Acquisitions and Dispositions (Details) - Weighted-average amortization | 12 Months Ended
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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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- 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 + Details
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