CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Real estate, at cost	$ 3,644,726	$ 3,564,466
Real estate - intangible assets	693,335	685,914
Investments in real estate under construction	47,041	65,122
Real estate, gross	4,385,102	4,315,502
Less: accumulated depreciation and amortization	1,175,812	1,150,417
Real estate, net	3,209,290	3,165,085
Cash and cash equivalents	111,404	34,024
Restricted cash	23,007	26,741
Investment in and advances to non-consolidated entities	11,825	27,129
Deferred expenses, net	59,520	57,549
Loans receivable, net	82,660	72,540
Rent receivable	8,499	7,355
Other assets	28,721	27,780
Total assets	3,534,926	3,418,203
Liabilities:
Mortgages and notes payable	1,268,654	1,415,961
Term loan payable	255,000	255,000
Convertible notes payable	38,491	78,127
Trust preferred securities	129,120	129,120
Dividends payable	36,612	31,351
Accounts payable and other liabilities	59,004	70,367
Accrued interest payable	7,330	11,980
Deferred revenue - including below market leases, net	74,353	79,908
Prepaid rent	24,808	13,224
Total liabilities	1,893,372	2,085,038
Commitments and contingencies
Equity:
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 213,653,183 and 178,616,664 shares issued and outstanding in 2013 and 2012, respectively	21	18
Additional paid-in-capital	2,560,662	2,212,949
Accumulated distributions in excess of net income	(1,182,969)	(1,143,803)
Accumulated other comprehensive loss	(5,522)	(6,224)
Total shareholders’ equity	1,615,982	1,306,730
Noncontrolling interests	25,572	26,435
Total equity	1,641,554	1,333,165
Total liabilities and equity	3,534,926	3,418,203
Series C | Cumulative Convertible
Equity:
Preferred shares, value	94,016	94,016
Series D | Cumulative Redeemable
Equity:
Preferred shares, value	$ 149,774	$ 149,774