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Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Option terms of lease	5 years
Minimum sublease rentals	$ 7,359
Number of sale leaseback transactions | item	6
Total deemed landlord financing	$ 2,630	$ 2,854
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

Number of sale leaseback transactions

+ References

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- Definition

Option terms of lease

+ References

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- Definition

Combined initial and option terms of lease

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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.

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- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

Present value of minimum lease payments for sale-leaseback transactions accounted for using the deposit method or as a financing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

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