CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment in real estate
Land	$ 6,281,124	$ 6,192,512
Depreciable property	19,623,472	19,226,047
Projects under development	865,177	988,867
Land held for development	295,357	393,522
Real Estate Investment Property, at Cost	27,065,130	26,800,948
Real Estate Investment Property, Accumulated Depreciation	(4,992,877)	(4,807,709)
Investment in real estate, net	22,072,253	21,993,239
Cash and cash equivalents	37,209	53,534
Investments in unconsolidated entities	205,068	178,526
Deposits - restricted	91,081	103,567
Escrow deposits - mortgage	43,995	42,636
Deferred financing costs, net	55,754	58,486
Other assets	384,271	404,557
Total assets	22,889,631	22,834,545
Liabilities:
Mortgage notes payable	5,167,626	5,174,166
Notes, net	5,477,656	5,477,088
Lines of credit	298,000	115,000
Accounts payable and accrued expenses	161,838	118,791
Accrued interest payable	78,140	78,309
Other liabilities	321,043	347,748
Security deposits	72,735	71,592
Distributions payable	187,759	243,511
Total liabilities	11,764,797	11,626,205
Commitments and contingencies
Redeemable Noncontrolling Interests - Operating Partnership	405,276	363,144
Shareholders' equity:
100,000,000 shares authorized; 1,000,000 shares issued and outstanding as of March 31, 2014 and December 31, 2013	50,000	50,000
1,000,000,000 shares authorized; 361,148,189 shares issued and outstanding as of March 31, 2014 and 360,479,260 shares issued and outstanding as of December 31, 2013	3,611	3,605
Paid in capital	8,541,046	8,561,500
Retained earnings	1,944,798	2,047,258
Accumulated other comprehensive (loss)	(162,894)	(155,162)
Total shareholders' equity	10,376,561	10,507,201
Noncontrolling Interests:
Operating Partnership	215,339	211,412
Noncontrolling Interests - Partially Owned Properties	127,658	126,583
Total Noncontrolling Interests	342,997	337,995
Total equity	10,719,558	10,845,196
Total liabilities and equity	$ 22,889,631	$ 22,834,545