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Dispositions (Details) ft² in Thousands, $ in Thousands					3 Months Ended	6 Months Ended
	May 17, 2018 USD ($) ft²	Mar. 01, 2018 USD ($)	Nov. 16, 2017 USD ($) ft²	Jan. 18, 2017 USD ($) ft²	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Discontinued Operations:
Proceeds from sale		$ 142,500
Cascade Mall
Discontinued Operations:
Property area (in square feet) | ft²				589
Northgate Mall
Discontinued Operations:
Property area (in square feet) | ft²				750
Cascade and Northgate Malls
Discontinued Operations:
Proceeds from sale				$ 170,000
Gain (loss) on disposal						$ 59,713
500 North Michigan Avenue
Discontinued Operations:
Property area (in square feet) | ft²			326
Proceeds from sale			$ 86,350
Gain (loss) on disposal			$ 14,597
Promenade at Casa Grande
Discontinued Operations:
Property area (in square feet) | ft²	761
Proceeds from sale	$ 26,000
Promenade at Casa Grande
Discontinued Operations:
Gain (loss) on disposal					$ (311)

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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