CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment in real estate
Land	$ 6,329,907	$ 6,192,512
Depreciable property	19,919,609	19,226,047
Projects under development	1,046,210	988,867
Land held for development	279,139	393,522
Real Estate Investment Property, at Cost	27,574,865	26,800,948
Real Estate Investment Property, Accumulated Depreciation	(5,314,260)	(4,807,709)
Investment in real estate, net	22,260,605	21,993,239
Cash and cash equivalents	31,478	53,534
Investments in unconsolidated entities	128,100	178,526
Deposits - restricted	84,945	103,567
Escrow deposits - mortgage	45,995	42,636
Deferred financing costs, net	60,530	58,486
Other assets	396,441	404,557
Total assets	23,008,094	22,834,545
Liabilities:
Mortgage notes payable	5,090,960	5,174,166
Notes, net	5,420,646	5,477,088
Lines of credit	446,000	115,000
Accounts payable and accrued expenses	203,070	118,791
Accrued interest payable	86,472	78,309
Other liabilities	349,371	347,748
Security deposits	75,738	71,592
Distributions payable	188,266	243,511
Total liabilities	11,860,523	11,626,205
Commitments and contingencies
Redeemable Noncontrolling Interests - Operating Partnership	430,149	363,144
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,000,000 shares issued and outstanding as of September 30, 2014 and December 31, 2013	50,000	50,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 362,208,087 shares issued and outstanding as of September 30, 2014 and 360,479,260 shares issued and outstanding as of December 31, 2013	3,622	3,605
Paid in capital	8,574,176	8,561,500
Retained earnings	1,915,344	2,047,258
Accumulated other comprehensive (loss)	(164,806)	(155,162)
Total shareholders' equity	10,378,336	10,507,201
Noncontrolling Interests:
Operating Partnership	213,889	211,412
Noncontrolling Interests - Partially Owned Properties	125,197	126,583
Total Noncontrolling Interests	339,086	337,995
Total equity	10,717,422	10,845,196
Total liabilities and equity	$ 23,008,094	$ 22,834,545