CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investment in real estate
Land	$ 4,384,200	$ 4,367,816
Depreciable property	15,606,315	15,554,740
Projects under development	185,621	160,190
Land held for development	360,955	325,200
Investment in real estate	20,537,091	20,407,946
Accumulated depreciation	(4,658,994)	(4,539,583)
Investment in real estate, net	15,878,097	15,868,363
Cash and cash equivalents	219,628	383,921
Investments in unconsolidated entities	14,803	12,327
Deposits - restricted	182,182	152,237
Escrow deposits - mortgage	11,428	10,692
Deferred financing costs, net	45,861	44,608
Other assets	129,248	187,155
Total assets	16,481,247	16,659,303
Liabilities:
Total Debt	4,056,976	4,111,487
Notes, net	5,355,590	5,609,574
Lines of credit	0	0
Accounts payable and accrued expenses	77,055	35,206
Accrued interest payable	79,489	88,121
Other liabilities	261,448	291,289
Security deposits	65,468	65,286
Distributions payable	109,043	179,079
Total liabilities	10,005,069	10,380,042
Redeemable Noncontrolling Interests - Operating Partnership	457,224	416,404
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,600,000 shares issued and outstanding as of March 31, 2012 and December 31, 2011	200,000	200,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 300,522,169 shares issued and outstanding as of March 31, 2012 and 297,508,185 shares issued and outstanding as of December 31, 2011	3,005	2,975
Paid in capital	5,152,975	5,047,186
Retained earnings	656,001	615,572
Accumulated other comprehensive (loss)	(189,973)	(196,718)
Total shareholders' equity	5,822,008	5,669,015
Noncontrolling Interests:
Operating Partnership	123,031	119,536
Partially Owned Properties	73,915	74,306
Total Noncontrolling Interests	196,946	193,842
Total equity	6,018,954	5,862,857
Total liabilities and equity	$ 16,481,247	$ 16,659,303