Consolidated Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
Real estate owned:
Real estate held for investment	$ 7,582,981,000	$ 7,564,780,000
Less: accumulated depreciation	(2,070,403,000)	(1,923,429,000)
Real estate held for investment, net	5,512,578,000	5,641,351,000
Real estate under development (net of accumulated depreciation)	432,461,000	489,795,000
Total real estate owned, net of accumulated depreciation	5,945,039,000	6,131,146,000
Cash and cash equivalents	9,035,000	12,115,000
Restricted cash	24,843,000	23,561,000
Deferred financing costs, net	27,043,000	24,990,000
Notes receivable, net	66,700,000	64,006,000
Investment in and advances to unconsolidated joint ventures, net	533,335,000	477,631,000
Other assets	137,548,000	125,654,000
Total assets	6,743,543,000	6,859,103,000
Liabilities:
Secured debt	1,385,034,000	1,430,135,000
Unsecured debt	2,009,689,000	1,979,198,000
Real estate taxes payable	14,586,000	14,076,000
Accrued interest payable	29,598,000	30,937,000
Security deposits and prepaid rent	26,726,000	25,025,000
Distributions payable	61,906,000	57,915,000
Accounts payable, accrued expenses, and other liabilities	111,056,000	104,567,000
Total liabilities	3,638,595,000	3,641,853,000
Commitments and contingencies (Note 12)
Redeemable non-controlling interests in operating partnership	237,653,000	223,418,000
Equity
Common stock, $0.01 par value; 350,000,000 shares authorized 250,741,559 shares issued and outstanding (250,139,408 shares at December 31, 2012)	2,507,000	2,501,000
Additional paid-in capital	4,104,200,000	4,098,882,000
Distributions in excess of net income	(1,279,095,000)	(1,143,781,000)
Accumulated other comprehensive income/(loss), net	(7,811,000)	(11,257,000)
Total stockholders' equity	2,866,372,000	2,992,916,000
Non-controlling interest	923,000	916,000
Total equity	2,867,295,000	2,993,832,000
Total liabilities and equity	6,743,543,000	6,859,103,000
8.00% Series E Cumulative Convertible Preferred Stock
Equity
Preferred stock, value	$ 46,571,000	$ 46,571,000