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Leases - Operating Leases (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) shopping_center | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items] |  |  |
Number of shopping centers with land leases | shopping_center | 7 |  |
Ground lease expense | $ 1.4 | $ 1.2 | $ 1.7
Rent expense capitalized | 0.1 | 0.6 | 0.9
Rent expense | $ 1.0 | $ 1.0 | $ 1.4
Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Period of lease term | 25 years |  |
Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Period of lease term | 71 years |  |

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- Definition Number Of Shopping Centers With Land Leases + References No definition available. + Details
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- Definition Operating Lease Lessee Period of Lease Term + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition 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 No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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