Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Allowance on deferred rent receivable	$ 25,630	$ 8,170
Allowance on notes, mortgages and accounts receivable	$ 9,480	$ 361
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	33,394,395	29,944,155