Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE (Details) (Narrative)

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EQUITY AND EARNINGS PER SHARE (Details) (Narrative) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 02, 2018
Jul. 31, 2018
May 02, 2018
Apr. 30, 2018
Mar. 06, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Class of Stock [Line Items]                    
Unrecognized stock-based compensation expense           $ 7.0   $ 7.0    
Dividends paid       $ 1.4            
Dilutive common stock equivalents (in shares)           0 0 0 0  
Stock options                    
Class of Stock [Line Items]                    
Antidilutive securities (in shares)           0 85,238 0 118,054  
Common stock equivalents                    
Class of Stock [Line Items]                    
Dilutive common stock equivalents (in shares)           2,893,372 1,556,785 2,702,628 1,748,034  
Subsequent event                    
Class of Stock [Line Items]                    
Dividends paid   $ 1.4                
Series B Cumulative Redeemable Preferred Stock                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share)     $ 0.609375   $ 0.609375          
Preferred stock, dividend rate (as percent)     9.75%   9.75%     9.75%   9.75%
Series B Cumulative Redeemable Preferred Stock | Subsequent event                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share) $ 0.609375                  
Preferred stock, dividend rate (as percent) 9.75%                  
Series C Cumulative Redeemable Preferred Stock                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share)     $ 0.503125   $ 0.503125          
Preferred stock, dividend rate (as percent)     8.05%   8.05%     8.05%   8.05%
Series C Cumulative Redeemable Preferred Stock | Subsequent event                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share) $ 0.503125                  
Preferred stock, dividend rate (as percent) 8.05%                  
Series D Cumulative Redemable Preferred Stock                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share)     $ 0.523438   $ 0.523438          
Preferred stock, dividend rate (as percent)     8.375%   8.375%     8.375%   8.375%
Series D Cumulative Redemable Preferred Stock | Subsequent event                    
Class of Stock [Line Items]                    
Dividends declared per share of preferred stock (in dollars per share) $ 0.523438                  
Preferred stock, dividend rate (as percent) 8.375%                  
Stock options                    
Class of Stock [Line Items]                    
Period prior to expiration date to exercise options granted               1 year    
Stock-based compensation expense           $ 0.5   $ 0.8    
Unrecognized stock-based compensation expense, period for recognition               4 years 2 months