CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Tenant and other receivables, allowance for doubtful accounts	$ 15,873	$ 17,930
Intangible assets, accumulated amortization	15,749	51,625
Mortgage loans payable, debt premium		282
Exchangeable notes, debt discount		849
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	25,000	25,000
Preferred shares, issued	4,600	0
Preferred shares, outstanding	4,600	0
Liquidation preference	$ 115,000
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	55,992	55,677
Common stock, shares outstanding	55,992	55,677