Segment Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reconciliation from reported net income to NOI and adjusted NOI
Net income	$ 216,725	$ 204,975	$ 450,509	$ 401,539
Interest income	(14,147)	(1,216)	(26,533)	(2,035)
Investment management fee income	(499)	(470)	(942)	(963)
Interest expense	108,716	102,354	218,006	206,044
Depreciation and amortization	110,686	84,873	215,314	170,062
General and administrative	24,073	14,801	44,744	34,884
Other income, net	(3,240)	(1,028)	(15,303)	(1,462)
Income taxes	1,654	171	2,530	(541)
Equity income from unconsolidated joint ventures	(15,585)	(15,732)	(30,386)	(29,407)
Total discontinued operations	(1,559)	(75)	(2,121)	(3,181)
NOI	426,824	388,653	855,818	774,940
Straight-line rents	2,838	(11,860)	(15,955)	(21,787)
DFL accretion	(21,394)	(22,017)	(45,564)	(47,639)
Amortization of above and below market lease intangibles, net	(5,990)	(625)	(6,068)	(1,322)
Lease termination fees	(15)	(251)	(15)	(399)
NOI adjustments related to discontinued operations	(4)	479	(10)	1,109
Adjusted NOI	$ 402,259	$ 354,379	$ 788,206	$ 704,902