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Acquisitions: Gain (Loss) on Remeasurement (Details) - USD ($) $ in Thousands					3 Months Ended	12 Months Ended
	Feb. 17, 2015	Nov. 14, 2014	Oct. 24, 2013	Sep. 17, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquisition
Carrying value of investment					$ (1,532,552)	$ (1,532,552)	$ (984,132)
Gain on remeasurement of assets						$ 22,089	$ 1,423,136	$ 51,205
Inland Center
Acquisition
Fair value of existing ownership interest	$ 26,250
Carrying value of investment	(4,161)
Gain on remeasurement of assets	$ 22,089
Camelback Colonnade
Acquisition
Fair value of existing ownership interest				$ 41,690
Carrying value of investment				(5,349)
Gain on remeasurement of assets				$ 36,341
Superstition Springs Land I
Acquisition
Fair value of existing ownership interest			$ 47,340
Carrying value of investment			(32,476)
Gain on remeasurement of assets			$ 14,864
PPR Queens Portfolio
Acquisition
Fair value of existing ownership interest		$ 1,214,401
Carrying value of investment		(208,735)
Gain on remeasurement of assets		$ 1,423,136			$ 1,423,136

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- Definition

Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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