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Leases (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |  |  |
Option terms of lease | 5 years |  |
Minimum cash lease payments | $ 90,484 |  |
Minimum sublease rentals | 11,790 |  |
Sublease income | $ 2,530 | $ 2,214 | $ 2,074
Number of sale leaseback transactions | item | 6 |  |
Total deemed landlord financing | $ 2,390 | $ 2,630 |
Shopping Center Or Building Leases [Member] | Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Combined initial and option terms lease | 20 years |  |
Shopping Center Or Building Leases [Member] | Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Combined initial and option terms lease | 25 years |  |
Ground Leases [Member] | Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Combined initial and option terms lease | 30 years |  |
Ground Leases [Member] | Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Combined initial and option terms lease | 40 years |  |

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- Definition Contractually required future cash lease payments. + References No definition available. + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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