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STOCKHOLDERS' EQUITY - Dividends (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Sep. 03, 2019
Aug. 30, 2019
USD ($)
Aug. 08, 2019
$ / shares
Jun. 04, 2019
$ / shares
Feb. 20, 2019
$ / shares
Jun. 04, 2018
$ / shares
Mar. 06, 2018
$ / shares
Jan. 11, 2018
USD ($)
Dec. 18, 2017
$ / shares
Jun. 30, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
Dividends Payable [Line Items]                      
Payments of special dividends | $                   $ 0 $ 1,575
Common Stock                      
Dividends Payable [Line Items]                      
Declared dividends per common share (in usd per share)       $ 0.125 $ 0.125 $ 0.12500 $ 0.12500        
Common Stock, Excluding Private Repurchase Participants                      
Dividends Payable [Line Items]                      
Declared dividends per common share (in usd per share)                 $ 0.73    
Payments of special dividends | $               $ 1,575      
Subsequent Event | Common Stock                      
Dividends Payable [Line Items]                      
Declared dividends per common share (in usd per share)     $ 0.025                
Quarterly dividend rate per common share (in usd per share)     0.025                
Declared dividends per common share after reverse stock split (in usd per share)     0.075                
Forecast | Subsequent Event                      
Dividends Payable [Line Items]                      
Reverse stock split ratio, common stock 0.3333                    
Special Dividend | Subsequent Event | Common Stock                      
Dividends Payable [Line Items]                      
Declared dividends per common share (in usd per share)     $ 14.00                
Special Dividend | Forecast | Subsequent Event | Common Stock                      
Dividends Payable [Line Items]                      
Payments of special dividends | $   $ 613,294                  
Ten Real Estate Properties Sold In 2019 | Disposal Group, Disposed of by Sale, Not Discontinued Operations                      
Dividends Payable [Line Items]                      
Number of real estate properties sold | property                   10