CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets:
Real estate, at cost	$ 3,182,741	$ 3,172,246
Investments in real estate under construction	40,311	34,529
Less: accumulated depreciation and amortization	665,723	638,368
Real estate, net	2,557,329	2,568,407
Intangible assets, net	170,121	178,569
Cash and cash equivalents	49,884	63,711
Restricted cash	22,245	30,657
Investment in and advances to non-consolidated entities	94,575	90,558
Deferred expenses, net	50,370	43,966
Loans receivable, net	66,132	66,619
Rent receivable - current	6,799	7,271
Other assets	29,065	28,290
Total assets	3,046,520	3,078,048
Liabilities:
Mortgages and notes payable	1,417,341	1,366,004
Exchangeable notes payable	0	62,102
Convertible notes payable	105,633	105,149
Trust preferred securities	129,120	129,120
Dividends payable	25,304	25,273
Accounts payable and other liabilities	45,589	53,058
Accrued interest payable	8,623	13,019
Deferred revenue - below market leases, net	86,759	90,349
Prepaid rent	25,245	12,543
Total liabilites	1,843,614	1,856,617
Commitments and contingencies
Equity:
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 155,419,094 and 154,938,351 shares issued and outstanding in 2012 and 2011,respectively	16	15
Additional paid-in-capital	2,013,968	2,010,850
Accumulated distributions in excess of net income	(1,182,838)	(1,161,402)
Accumulated other comprehensive income (loss)	1,882	1,938
Total shareholders' equity	1,143,011	1,163,074
Noncontrolling interests	59,895	58,357
Total equity	1,202,906	1,221,431
Total liabilities and equity	3,046,520	3,078,048
Series B | Cumulative Redeemable
Equity:
Preferred shares, value	66,193	66,193
Series C | Cumulative Convertible
Equity:
Preferred shares, value	94,016	95,706
Series D | Cumulative Redeemable
Equity:
Preferred shares, value	$ 149,774	$ 149,774