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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS    
Properties held-for-sale, accumulated depreciation and amortization (in dollars) $ 804 $ 1,141
Mortgage loans receivable, allowance for doubtful accounts (in dollars) 396 782
Straight-line rent receivable, allowance for doubtful accounts (in dollars) 1,532 1,557
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 2,000
Preferred stock, shares outstanding 2,000 2,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 60,000 60,000
Common stock, shares issued 34,752 30,544
Common stock, shares outstanding 34,752 30,544
Straight-line rent receivable from a lessee that qualifies as a related party (in dollars) $ 3,206 $ 3,191