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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended				12 Months Ended		1 Months Ended		1 Months Ended			1 Months Ended			1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	May 31, 2012 Mervyn's	Nov. 30, 2011 Mervyn's	Oct. 31, 2011 Mervyn's	Mar. 31, 2011 Mervyn's	Dec. 31, 2011 Shoppingtown Mall	Jun. 29, 2011 Shoppingtown Mall	Apr. 30, 2012 Valley View Mall	Mar. 31, 2012 Valley View Mall	Apr. 30, 2012 The Borgata squarefoot	May 31, 2012 Hilton Village.	May 17, 2012 Hilton Village. squarefoot	May 31, 2012 Prescott Gateway squarefoot	Jun. 30, 2012 Carmel Plaza	Jun. 28, 2012 Carmel Plaza squarefoot	Jun. 30, 2011 GGP Exchange store	Jun. 30, 2011 GGP Exchange Mervyn's entity
Discontinued Operations:
Proceeds from sale					$ 20,750	$ 2,300	$ 8,061	$ 3,732					$ 9,150	$ 24,820			$ 52,000
Gain (loss) from sale	(253)	342	74,906	(37,648)	(407)	(200)	3,783	(1,913)					(1,275)	3,127			7,844
Number of anchor locations exchanged																			6	5
Impairment charge										35,729		54,306
Long-lived assets written off to fair value										38,968		33,450
Gain (loss) on extinguishment of debt				(9,133)					(3,929)		104,033					16,296
Property square footage													93,693		79,814	583,959		111,945
Revenues from discontinued operations	1	9,364	10,599	30,641
(Loss) income from discontinued operations	$ (263)	$ (4,556)	$ 69,447	$ (50,508)

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Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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