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Dispositions: (Details) ft² in Thousands, $ in Thousands			3 Months Ended
	Nov. 19, 2015 USD ($) ft²	Jun. 30, 2015 USD ($) ft²	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Discontinued Operations:
Gain on early extinguishment of debt, net			$ (8,453)	$ (2,245)
Great Northern Mall | Great Northern Mall
Discontinued Operations:
Property area (in square feet) | ft²		895
Gain on early extinguishment of debt, net		$ (1,627)
Panorama Mall [Member]
Discontinued Operations:
Property area (in square feet) | ft²	312
Proceeds from sale	$ 98,000
Gain (loss) on disposal	$ 73,726

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- Definition

Area of a real estate property.

+ References

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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
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-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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

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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

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