Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended								12 Months Ended		1 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Feb. 28, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2013 Shopping Center, D'Iberville, Mississippi [Member] The Promenade D'iberville, LLC [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Jun. 30, 2013 Citadel Mall [Member]	Dec. 31, 2013 Madison Square [Member]	Dec. 31, 2013 Madison Square [Member]	Dec. 26, 2012 Imperial Valley Mall [Member]
Real Estate Properties [Line Items]
Total revenues		$ 282,009	$ 257,550	$ 255,584	$ 258,482	$ 270,248	$ 249,185	$ 244,516	$ 238,894	$ 1,053,625	$ 1,002,843
Income from operations		62,368	97,709	77,081	93,607	94,009	94,409	92,232	89,271	330,765	369,921
Income from continuing operations		8,983	52,234	16,255	37,845	82,441	36,166	34,674	32,768	115,317	186,049
Discontinued operations		(914)	(8,057)	1,984	2,040	3,642	(23,674)	4,719	3,783	(4,947)	(11,530)
Net income		8,069	44,177	18,239	39,885	86,083	12,492	39,393	36,551	110,370	174,519
Net income attributable to the Company		8,843	34,324	11,724	30,313	68,086	8,074	29,391	26,049	85,204	131,600
Net income (loss) attributable to common shareholders		(2,380)	23,101	501	19,090	52,357	(2,520)	18,797	15,455	40,312	84,089
Basic per share/unit data attributable to common shareholders/unitholders:
Income from continuing operations, net of preferred dividends		$ (0.01)	$ 0.18	$ (0.01)	$ 0.11	$ 0.31	$ 0.11	$ 0.10	$ 0.08	$ 0.27	$ 0.60
Net income (loss) attributable to common shareholders		$ (0.01)	$ 0.14	$ 0.00	$ 0.12	$ 0.33	$ (0.02)	$ 0.12	$ 0.10	$ 0.24	$ 0.54
Diluted per share/unit data attributable to common shareholders/unitholders:
Income from continuing operations, net of preferred dividends		$ (0.01)	$ 0.18	$ (0.01)	$ 0.11	$ 0.31	$ 0.11	$ 0.10	$ 0.08	$ 0.27	$ 0.60
Net income (loss) attributable to common shareholders		$ (0.01)	$ 0.14	$ 0.00	$ 0.12	$ 0.33	$ (0.02)	$ 0.12	$ 0.10	$ 0.24	$ 0.54
Loss on impairment of real estate															20,453	47,212	47,212
Gain (loss) on extinguishment of debt				9,108
Prepayment fee				8,708
Realized gain recorded in earnings													2,400	0
Proceeds from legal settlements	800											8,240
Gain on investment																		$ 45,072