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SUBSEQUENT EVENTS (Distributions) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Nov. 05, 2018
Nov. 01, 2018
Oct. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 06, 2017
Subsequent Event [Line Items]                
Distribution rate per share per day, declared (in dollars per share)       $ 0.00178082 $ 0.00178082 $ 0.00178082 $ 0.00178082  
Dividend Authorized | Most Recent Primary Offering Purchase Price                
Subsequent Event [Line Items]                
Common stock, purchase price per share (in dollars per share)               $ 11.73
Subsequent Event | Dividend Paid                
Subsequent Event [Line Items]                
Dividends, common stock, cash   $ 9.8 $ 9.4          
Subsequent Event | Dividend Authorized                
Subsequent Event [Line Items]                
Distribution rate per share per day, declared (in dollars per share) $ 0.00178082              
Distribution rate per share annualized, declared, based on current estimated value 5.54%