Quarterly report pursuant to Section 13 or 15(d)

EQUITY AND EARNINGS PER SHARE (Narrative) (Details)

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EQUITY AND EARNINGS PER SHARE (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 11, 2019
Oct. 31, 2019
Jul. 31, 2019
Jul. 30, 2019
May 07, 2019
Apr. 29, 2019
Mar. 13, 2019
Jul. 31, 2019
Nov. 30, 2018
Aug. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Class of Stock [Line Items]                              
Dividends paid     $ 1.4     $ 1.4                  
Stock options                              
Class of Stock [Line Items]                              
Antidilutive securities (in shares)                     333,170 0 481,639 0  
Common stock equivalents                              
Class of Stock [Line Items]                              
Dilutive common stock equivalents (in shares)                     1,915,008 3,004,777 2,328,494 2,804,451  
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   $ 0.609375                
Preferred stock, dividend rate (as percent)       9.75% 9.75%   9.75%           9.75%   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   $ 0.503125                
Preferred stock, dividend rate (as percent)       8.05% 8.05%   8.05%           8.05%   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   $ 0.523438                
Preferred stock, dividend rate (as percent)       8.375% 8.375%   8.375%           8.375%   8.375%
Stock options                              
Class of Stock [Line Items]                              
Stock-based compensation expense (amount less than for RSUs)               $ (1.2)     $ (0.1) $ 0.5 $ 2.3 $ 1.3  
Unrecognized stock-based compensation expense                     $ 9.0   $ 9.0    
Unrecognized stock-based compensation expense, period for recognition                         2 years 3 months 1 day    
Vesting period                 3 years            
Dilutive common stock equivalents (in shares)                     0 0 0 0  
Restricted Stock Units (RSUs)                              
Class of Stock [Line Items]                              
Stock-based compensation expense (amount less than for RSUs)                     $ 0.3 $ 0.1 $ 0.5 $ 0.1  
Unrecognized stock-based compensation expense                     $ 2.1   $ 2.1    
Unrecognized stock-based compensation expense, period for recognition                         2 years 5 months 20 days    
Shares issued upon vesting                         17,452    
Granted (in shares)                         589,967    
Dilutive common stock equivalents (in shares)                     0 0 0 0  
Subsequent event                              
Class of Stock [Line Items]                              
Dividends paid   $ 1.4                          
Subsequent event | Series B Cumulative Redeemable Preferred Stock                              
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%                            
Subsequent event | Series C Cumulative Redeemable Preferred Stock                              
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%                            
Subsequent event | Series D Cumulative Redemable Preferred Stock                              
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%                            
Nonemployee | Restricted Stock Units (RSUs)                              
Class of Stock [Line Items]                              
Vesting period                   1 year          
Granted (in shares)                         37,944    
Employee | Restricted Stock Units (RSUs)                              
Class of Stock [Line Items]                              
Granted (in shares)                         552,023