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Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Leasing revenues	$ 215,026
Revenues from contracts with customers (ASC 606)	4,052
Other revenues	1,122
Total revenues	220,200	$ 238,013
Management, Development and Leasing Fees
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606)	2,721
Marketing
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606)	1,331
Malls
Disaggregation of Revenue [Line Items]
Total revenues	200,715	221,931
Malls | Marketing
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606)	1,326
All Other
Disaggregation of Revenue [Line Items]
Total revenues	19,485	$ 16,082
All Other | Marketing
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers (ASC 606)	$ 5

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

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Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a),(d))
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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-Section S99
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