Segment Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation from reported net income to NOI and adjusted NOI
Net income	$ 236,858	$ 199,043	$ 687,367	$ 600,582
Interest income	(42,078)	(10,278)	(68,611)	(12,313)
Investment management fee income	(464)	(460)	(1,406)	(1,423)
Interest expense	108,088	103,355	326,094	309,399
Depreciation and amortization	104,859	87,170	317,430	254,463
General and administrative	45,423	19,415	90,080	54,299
Impairments		7,878		7,878
Other income, net	(1,584)	(770)	(16,887)	(2,232)
Income taxes	1,033	(602)	3,563	(1,145)
Equity income from unconsolidated joint ventures	(13,892)	(13,396)	(44,278)	(42,803)
Total discontinued operations	(13,396)	(6,680)	(25,059)	(19,476)
NOI	424,847	384,675	1,268,293	1,147,229
Straight-line rents	(12,604)	(11,821)	(28,559)	(33,608)
DFL accretion	(19,822)	(23,433)	(65,386)	(71,072)
Amortization of above and below market lease intangibles, net	(346)	(533)	(6,414)	(1,855)
Lease termination fees	(205)	(175)	(220)	(574)
NOI adjustments related to discontinued operations	99	436	293	1,757
Adjusted NOI	$ 391,969	$ 349,149	$ 1,168,007	$ 1,041,877