CONSOLIDATED BALANCE SHEETS (Unaudited) - Class of Stock [Domain] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment in real estate
Land	$ 6,374,779	$ 6,295,404
Depreciable property	20,290,324	19,851,504
Projects under development	1,240,244	1,343,919
Land held for development	127,559	184,556
Investment in real estate	28,032,906	27,675,383
Real Estate Investment Property, Accumulated Depreciation	(5,736,913)	(5,432,805)
Investment in real estate, net	22,295,993	22,242,578
Cash and cash equivalents	92,109	40,080
Investments in unconsolidated entities	94,718	105,434
Deposits - restricted	103,508	72,303
Escrow deposits - mortgage	52,862	48,085
Deferred financing costs, net	59,605	58,380
Other assets	383,035	383,754
Total assets	23,081,830	22,950,614
Liabilities:
Mortgage notes payable	4,952,579	5,086,515
Notes, net	5,875,328	5,425,346
Line of credit and commercial paper	0	333,000
Accounts payable and accrued expenses	193,096	153,590
Accrued interest payable	87,131	89,540
Other liabilities	355,632	389,915
Security deposits	76,112	75,633
Distributions payable	209,041	188,566
Total liabilities	11,748,919	11,742,105
Redeemable Noncontrolling Interests - Operating Partnership	488,178	500,733
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 803,600 shares issued and outstanding as of June 30, 2015 and 1,000,000 shares issued and outstanding as of December 31, 2014	40,180	50,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 364,050,890 shares issued and outstanding as of June 30, 2015 and 362,855,454 shares issued and outstanding as of December 31, 2014	3,641	3,629
Paid in capital	8,607,889	8,536,340
Retained earnings	2,012,909	1,950,639
Accumulated other comprehensive (loss)	(163,855)	(172,152)
Total shareholders' equity	10,500,764	10,368,456
Noncontrolling Interests:
Operating Partnership	221,601	214,411
Noncontrolling Interests - Partially Owned Properties	122,368	124,909
Total Noncontrolling Interests	343,969	339,320
Total equity	10,844,733	10,707,776
Total liabilities and equity	$ 23,081,830	$ 22,950,614