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Property: (Details 2) (USD $) In Thousands, unless otherwise specified	0 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended		3 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended
	Oct. 26, 2012	Jun. 03, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 17, 2013 Camelback Colonnade	Dec. 31, 2013 Camelback Colonnade	Dec. 31, 2013 Superstition Springs Center	Feb. 28, 2011 Desert Sky Mall	Dec. 31, 2011 Desert Sky Mall	Oct. 24, 2013 Superstition Springs Land I	Oct. 03, 2012 FlatIron Crossing	Dec. 31, 2013 FlatIron Crossing	Dec. 31, 2012 FlatIron Crossing	Jun. 03, 2011 Superstition Springs Land	Dec. 31, 2011 Superstition Springs Land	Oct. 26, 2012 Arrowhead Towne Center	Dec. 31, 2013 Arrowhead Towne Center	Dec. 31, 2013 Chandler Village Center, Chandler Festival, Chandler Gateway and NorthPark Center
Purchase of interest in property
Gain on remeasurement	$ 115,729	$ 1,734				$ 36,341	$ 36,341	$ 14,864	$ 1,868	$ 1,868	$ 14,864	$ 84,227	$ 84,227		$ 1,734	$ 1,734	$ 115,729	$ 115,729
Ownership percentage purchased									50.00%	50.00%	33.30%	75.00%		75.00%	50.00%		33.30%
Gain (Loss) on sale of assets			5,390	(390)	(423)														48,484
Write off of development cost			(1,250)	19,360
Impairment charge			$ (82,197)		$ (25,216)

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In a business combination achieved in stages, this element represents the additional percentage of equity interests acquired.

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Represents the development cost written off during the period.

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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.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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