CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
REVENUES
Rental income	$ 525,595	$ 464,550
Fee and asset management	2,064	1,806
Total revenues	527,659	466,356
EXPENSES
Property and maintenance	112,379	105,047
Real estate taxes and insurance	55,987	52,139
Property management	23,409	22,381
Fee and asset management	1,307	948
Depreciation	174,737	158,455
General and administrative	13,688	11,433
Total expenses	381,507	350,403
Operating income	146,152	115,953
Interest and other income	172	1,011
Other expenses	(7,067)	(2,160)
Interest:
Expense incurred, net	(118,703)	(120,528)
Amortization of deferred financing costs	(2,974)	(3,005)
Income (loss) before income and other taxes and discontinued operations	17,580	(8,729)
Income and other tax (expense) benefit	(191)	(184)
Income (loss) from continuing operations	17,389	(8,913)
Discontinued operations, net	134,778	141,979
Net income	152,167	133,066
Net (income) loss attributable to Noncontrolling Interests:
Operating Partnership	(6,418)	(5,775)
Partially Owned Properties	(450)	40
Net income attributable to controlling interests	145,299	127,331
Preferred distributions	(3,466)	(3,466)
Net income available to Common Shares	$ 141,833	$ 123,865
Earnings per share - basic:
Income (loss) from continuing operations available to Common Shares	$ 0.043	$ (0.040)
Net income available to Common Shares	$ 0.475	$ 0.423
Weighted average Common Shares outstanding	298,805	292,895
Earnings per share - diluted:
Income (loss) from continuing operations available to Common Shares	$ 0.043	$ (0.040)
Net income available to Common Shares	$ 0.470	$ 0.423
Weighted average Common Shares outstanding	315,230	292,895
Distributions declared per Common Share outstanding	$ 0.3375	$ 0.3375