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STOCKHOLDERS' EQUITY (Details 2) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Aug. 09, 2012
Feb. 11, 2011
item
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity            
Cash distributions declared per share of common stock (in dollars per share)       $ 1.42 $ 1.34 $ 1.32
Common shares issued under the Distribution Reinvestment Plan       210,000 215,000 255,000
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars) $ 50,000,000          
Number of shares sold   2,700,000   363,463 120,844  
Proceeds from sale of shares, net of commission and before offering costs   40,569,000   9,227,800 2,296,000  
Payment of commissions on sale of shares       93,000 23,000  
Payment of offering costs on sale of shares       63,000 165,000  
Number of mortgages to be repaid   2        
Repayment of mortgages payable   7,700,000   4,708,000 32,422,000 15,302,000
Weighted average interest rate (as a percent)   7.90%        
Decrease in outstanding amount   26,200,000   9,250,000 34,550,000 44,700,000
Payments made to purchase a property     $ 2,325,000 $ 107,529,000 $ 44,616,000  
Maximum
            
Stockholders' Equity            
Discount rate (as a percent)       5.00%