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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended									1 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended				0 Months Ended	1 Months Ended			0 Months Ended			0 Months Ended
	Dec. 11, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 04, 2013 Mervyn's	Oct. 23, 2013 Mervyn's	Oct. 15, 2013 Mervyn's	Sep. 11, 2013 Mervyn's	May 11, 2012 Mervyn's	Nov. 30, 2011 Mervyn's	Oct. 14, 2011 Mervyn's	Mar. 04, 2011 Mervyn's	Dec. 29, 2011 Shoppingtown Mall	Jun. 30, 2011 Shoppingtown Mall	Apr. 23, 2012 Valley View Mall	Mar. 31, 2012 Valley View Mall	Apr. 30, 2012 The Borgata sqft	May 17, 2012 Hilton Village sqft	May 31, 2013 Prescott Gateway	May 31, 2012 Prescott Gateway sqft	Jun. 28, 2012 Carmel Plaza sqft	Sep. 30, 2013 Fiesta Mall	Dec. 31, 2012 Fiesta Mall	Dec. 31, 2013 Fiesta Mall sqft	May 31, 2013 Green Tree Mall sqft	Jun. 04, 2013 Northridge Mall sqft	Jun. 04, 2013 Rimrock Mall sqft	Jun. 04, 2013 Rimrock Mall and Nortridge Mall	Dec. 11, 2013 Chesterfield Towne Center sqft	Dec. 11, 2013 Centre at Salisbury sqft	Jun. 03, 2011 GGP Exchange store	Mar. 04, 2011 GGP Exchange Mervyn's entity
Discontinued Operations:
Proceeds from sale	$ 292,500				$ 10,475	$ 5,430	$ 5,700	$ 12,000	$ 20,750	$ 2,300	$ 8,061	$ 3,732					$ 9,150	$ 24,820			$ 52,000				$ 79,000			$ 230,000
Gain (loss) from sale		286,414	50,811	(58,333)	(5,257)	1,695	(2,031)	(2,633)	(407)	(200)	3,783	(1,913)					(1,275)	3,127			7,844				59,767			82,151
Proceeds from Divestiture of Business, Cash																													67,763
Proceeds from Divestiture of Business, Assumption of Debt																													109,737	115,000
Number of anchor locations exchanged																															6	5
Impairment charge														35,729		54,306							(24,555)
Property square footage																	94,000	80,000		584,000	112,000			933,000	793,000	890,000	603,000		1,016,000	862,000
Long-lived assets written off to fair value														38,968	33,450
Gain (loss) on extinguishment of debt		1,432	0	(1,485)									(3,929)		104,023				16,296			1,252
Revenues from discontinued operations		54,752	94,406	118,558
Gain (loss) income from discontinued operations		$ 289,936	$ 63,223	$ (70,367)

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