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STOCKHOLDERS' EQUITY (Details 2) - USD ($)
 12 Months Ended
Mar. 20, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity        
Cash distributions declared per share of common stock (in dollars per share)   $ 1.58 $ 1.50 $ 1.42
Common shares issued under the Distribution Reinvestment Plan   197,000 227,000 210,000
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars) $ 38,360,000      
Number of shares sold (in shares)   295,190 179,051  
Proceeds from sale of shares, net of commission and before offering costs   $ 6,581,000 $ 3,890,000  
Payment of commissions on sale of shares   66,000 39,000  
Payment of Offering Costs on Sale of Shares   $ 124,000 $ 122,000  
Maximum        
Stockholders' Equity        
Discount rate (as a percent)   5.00%