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Discontinued Operations: (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		0 Months Ended		0 Months Ended					0 Months Ended			0 Months Ended
	Dec. 11, 2013	Mar. 31, 2014	Mar. 31, 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	Mar. 31, 2014 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:
Proceeds from sale	$ 292,500			$ 79,000		$ 10,475	$ 5,430	$ 5,700	$ 12,000		$ 230,000
Gain (loss) from sale		0	6	59,767		(5,257)	1,695	(2,031)	(2,633)		82,151					151,467
Gain (loss) on extinguishment of debt		(358)	0									1,252
Property area (in square feet)				793,000	890,000					603,000			933,000	1,016,000	862,000
Revenues from discontinued operations			19,478
Income from discontinued operations		0	2,556
Proceeds from Divestiture of Business, Cash														67,763
Proceeds from Divestiture of Business, Assumption of Debt														$ 109,737	$ 115,000

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