CONSOLIDATED STATEMENT OF EQUITY (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Earnings (Distributions) in Excess of Distributions (Earnings)	Noncontrolling Interest
BALANCE at Dec. 31, 2009	$ 3,318,125	$ 4,797	$ (2,961,177)	$ 8,393,643	$ (12,649)	$ (2,109,532)	$ 3,043
BALANCE (shares) at Dec. 31, 2009		479,703,633	(78,106,649)
Stock based compensation related activity (shares)		4,646,904
Stock based compensation related activity	174,077	46		174,031
Issuance of common stock upon exercise of warrants (shares)		1,631,061
Issuance of common stock upon exercise of warrants	6,859	16		6,843
Issuance of common stock-Stock Purchase Plan (shares)		75,354
Issuance of common stock-Stock Purchase Plan	2,577	1		2,576
Treasury stock activity (shares)			(9,273,069)
Treasury stock activity	(420,789)		(420,789)
Net change in fair value of cash flow hedges, net of tax	9,496				9,496
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	118				118
Reclassification of unrealized losses on available-for-sale securities to net income	0
Net unrealized (loss) gain on available-for-sale securities, net of tax	7				7
Foreign currency translation adjustments, net of tax	41,081				41,081
Reclassifications Due To REIT Conversion	0
Other comprehensive (loss) income	50,702
Distributions to noncontrolling interest	(599)						(599)
Net income	373,606					372,936	670
BALANCE at Dec. 31, 2010	3,504,558	4,860	(3,381,966)	8,577,093	38,053	(1,736,596)	3,114
BALANCE (shares) at Dec. 31, 2010		486,056,952	(87,379,718)
Stock based compensation related activity (shares)		3,033,698
Stock based compensation related activity	128,158	30		128,128
Issuance of common stock-Stock Purchase Plan (shares)		79,049
Issuance of common stock-Stock Purchase Plan	3,523	1		3,522
Treasury stock activity (shares)			(8,147,902)
Treasury stock activity	(423,932)		(423,932)
Net change in fair value of cash flow hedges, net of tax	1,977				1,977
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	225				225
Reclassification of unrealized losses on available-for-sale securities to net income	0
Net unrealized (loss) gain on available-for-sale securities, net of tax	(104)				(104)
Foreign currency translation adjustments, net of tax	(187,466)				(181,016)		(6,450)
Reclassifications Due To REIT Conversion	(1,752)				(1,752)
Other comprehensive (loss) income	(187,120)
Retirement of treasury stock (shares)		(95,527,620)	95,527,620
Retirement of treasury stock		(955)	3,805,898	(3,804,943)
Contributions from noncontrolling interests	141,387						141,387
Distributions to noncontrolling interest	(507)						(507)
Dividends/distributions declared	(137,765)					(137,765)
Net income	381,840					396,462	(14,622)
BALANCE at Dec. 31, 2011	3,410,142	3,936	0	4,903,800	(142,617)	(1,477,899)	122,922
BALANCE (shares) at Dec. 31, 2011		393,642,079	0
Stock based compensation related activity (shares)		2,233,390
Stock based compensation related activity	103,820	22		103,798
Issuance of common stock-Stock Purchase Plan (shares)		87,749
Issuance of common stock-Stock Purchase Plan	4,527	1		4,526
Treasury stock activity (shares)	(872,005)		(872,005)
Treasury stock activity	(62,728)		(62,728)
Net change in fair value of cash flow hedges, net of tax	(5,315)				(4,733)		(582)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	1,132				998		134
Reclassification of unrealized losses on available-for-sale securities to net income	495				495
Net unrealized (loss) gain on available-for-sale securities, net of tax	0
Foreign currency translation adjustments, net of tax	(58,387)				(37,490)		(20,897)
Reclassifications Due To REIT Conversion	0
Other comprehensive (loss) income	(62,075)
Contributions from noncontrolling interests	53,341						53,341
Distributions to noncontrolling interest	(580)						(580)
Dividends/distributions declared	(356,291)					(356,291)
Net income	594,025					637,283	(43,258)
BALANCE at Dec. 31, 2012	$ 3,684,181	$ 3,959	$ (62,728)	$ 5,012,124	$ (183,347)	$ (1,196,907)	$ 111,080
BALANCE (shares) at Dec. 31, 2012		395,963,218	(872,005)