Noncontrolling Interests and Redeemable Noncontrolling Interests (Details 3) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 PJV Units [Member]	Jun. 30, 2012 PJV Units [Member]	Jun. 30, 2013 Reedemable Non Controlling Interest [Member]	Dec. 31, 2012 Reedemable Non Controlling Interest [Member]	Jun. 30, 2013 Noncontrolling Interest [Member]	Dec. 31, 2012 Noncontrolling Interest [Member]	Jun. 30, 2013 Third Party Interests [Member]	Dec. 31, 2012 Third Party Interests [Member]	Jun. 30, 2013 Other Consolidated Subsidiaries [Member]	Dec. 31, 2012 Other Consolidated Subsidiaries [Member]	Jun. 30, 2013 Kirkwood Mall [Member]	Apr. 08, 2013 Kirkwood Mall [Member]	Jun. 30, 2013 Louisville Outlet Shoppes [Member]	Jun. 30, 2013 Outlet Shoppes at El Paso [Member]	Jun. 30, 2013 Triangle Town Member LLC [Member]
Noncontrolling Interest [Line Items]
Percentage of Equity Interest in Real Estate Property													51.00%		65.00%	75.00%	50.00%
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 464,248	$ 464,082			$ 40,471	$ 40,248			$ 34,209	$ 33,835	$ 6,262	$ 6,413
Non-controlling interests							165,793	192,404	144,043	128,907	21,750	63,497
Business Acquisition, Purchase Price Allocation, Liabilities Assumed														40,368
Increase (Decrease) in Redeemable Noncontrolling Preferred Joint Venture Interest
Redeemable noncontrolling preferred joint venture interest	423,777	423,834	423,834	423,834
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, Redeemable			10,228	10,286
Distributions to redeemable noncontrolling preferred joint venture interest			(10,285)	(10,343)
Redeemable noncontrolling preferred joint venture interest	$ 423,777	$ 423,834	$ 423,777	$ 423,777