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STOCKHOLDERS' EQUITY - Common Stock Dividend Distributions (Details) - USD ($)
 12 Months Ended
Jan. 11, 2017
Mar. 20, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity          
Cash distributions declared per share of common stock (in dollars per share)     $ 1.66 $ 1.58 $ 1.50
Common shares issued under the Distribution Reinvestment Plan     142,000 197,000 227,000
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement   $ 38,360,000      
Number of shares sold (in shares) 27,800   1,079,862 295,190  
Proceeds from sale of shares, net of commission and before offering costs $ 692,000   $ 25,947,000 $ 6,581,000  
Payment of commissions on sale of shares $ 7,000   262,000 66,000  
Payment of Offering Costs on Sale of Shares     $ 160,000 $ 124,000  
Maximum          
Stockholders' Equity          
Discount rate (as a percent)     5.00%