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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS    
Properties held-for-sale, accumulated depreciation and amortization (in dollars) $ 613 $ 505
Mortgage loans receivable, allowance for doubtful accounts (in dollars) 921 981
Straight-line rent receivable, allowance for doubtful accounts (in dollars) 680 634
Other assets related to properties held-for-sale, allowance for doubtful accounts (in dollars) 839 839
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 15,000 15,000
Preferred stock, shares issued 2,000 5,536
Preferred stock, shares outstanding 2,000 5,536
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 45,000 45,000
Common stock, shares issued 30,346 26,345
Common stock, shares outstanding 30,346 26,345
Straight-line rent receivable from a lessee that qualifies as a related party (in dollars) 3,060 2,822
Marketable securities issued by an entity that qualifies as a related party (in dollars) $ 6,500 $ 6,500