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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended		0 Months Ended					0 Months Ended
	Dec. 11, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2013 Green Tree Mall sqft	Jun. 04, 2013 Northridge Mall sqft	Dec. 04, 2013 Mervyn's	Oct. 23, 2013 Mervyn's	Oct. 15, 2013 Mervyn's	Sep. 11, 2013 Mervyn's	Jun. 04, 2013 Rimrock Mall sqft	Jun. 04, 2013 Rimrock Mall and Nortridge Mall	Sep. 30, 2013 Fiesta Mall sqft	Dec. 11, 2013 Chesterfield Towne Center sqft	Dec. 11, 2013 Centre at Salisbury sqft	Dec. 11, 2013 Chesterfield Towne Center
Discontinued Operations:
Property area (in square feet)						793,000	890,000					603,000		933,000	1,016,000	862,000
Proceeds from sale	$ 292,500					$ 79,000		$ 10,475	$ 5,430	$ 5,700	$ 12,000		$ 230,000
Gain (loss) from sale		0	(7,767)	0	134,145	59,767		(5,257)	1,695	(2,031)	(2,633)		82,151				151,467
Gain (loss) on extinguishment of debt		(46)	(6)	(405)	1,938									1,401
Cash payment															67,763
Assumption of debt															109,737	115,000
Revenues from discontinued operations		10,926		47,427
(Loss) income from discontinued operations		$ 0	$ (8,844)	$ 0	$ 137,112

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