Investment in Unconsolidated Entities (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:
Minimum rent	$ 795,809	$ 759,039	$ 2,351,876	$ 2,207,334
Overage rent	56,511	51,170	134,458	110,277
Tenant reimbursements	367,702	342,443	1,059,834	979,300
Other income	48,621	43,671	112,553	145,813
Total revenue	1,302,256	1,228,617	3,753,877	3,535,652
Operating Expenses:
Property operating	126,706	132,378	354,094	353,136
Depreciation and amortization	326,073	310,244	961,344	907,217
Real estate taxes	113,145	105,694	332,259	311,173
Repairs and maintenance	27,747	26,556	84,579	78,862
Advertising and promotion	30,725	28,114	81,343	77,762
Provision for (recovery of) credit losses	2,774	(1,180)	4,207	5,271
Other	25,804	20,636	62,411	58,424
Total operating expenses	701,691	663,664	2,030,734	1,929,651
OPERATING INCOME	600,565	564,953	1,723,143	1,606,001
Interest expense	(284,491)	(288,896)	(849,482)	(835,532)
Income from Unconsolidated Entities	47,916	37,129	158,663	96,613
Equity Method Investments | Unconsolidated property interests
Revenue:
Minimum rent	408,204	370,183	1,201,748	1,091,701
Overage rent	40,784	44,002	128,565	128,622
Tenant reimbursements	197,494	176,544	569,044	508,698
Other income	40,903	34,754	122,505	121,686
Total revenue	687,385	625,483	2,021,862	1,850,707
Operating Expenses:
Property operating	125,329	125,162	364,494	351,963
Depreciation and amortization	135,457	125,828	389,843	375,280
Real estate taxes	55,374	45,068	160,152	132,618
Repairs and maintenance	15,653	15,418	48,156	45,269
Advertising and promotion	14,141	11,706	44,164	39,600
Provision for (recovery of) credit losses	192	(646)	1,772	(247)
Other	37,948	36,089	110,129	128,134
Total operating expenses	384,094	358,625	1,118,710	1,072,617
OPERATING INCOME	303,291	266,858	903,152	778,090
Interest expense	(151,579)	(148,891)	(453,573)	(451,581)
Income from Continuing Operations	151,712	117,967	449,579	326,509
Gain (loss) from operations of discontinued joint venture interests	7	(1,978)	(339)	(20,769)
Gain (loss) on disposal of discontinued operations	6,580	(4,904)	24,936	(4,904)
Net Income	158,299	111,085	474,176	300,836
Third-party investors' share of net income	85,211	66,308	263,926	163,108
Our share of net income	73,088	44,777	210,250	137,728
Amortization of excess investment	(25,733)	(21,726)	(75,415)	(55,059)
Our share of loss on sale or disposal of assets and interests in unconsolidated entities, net		9,245		9,245
Income from Unconsolidated Entities	$ 47,355	$ 32,296	$ 134,835	$ 91,914