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. 07, 2018
Aug. 22, 2018
Aug. 02, 2018
Jul. 31, 2018
May 02, 2018
Apr. 30, 2018
Mar. 06, 2018
Oct. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
May 25, 2018
Class of Stock [Line Items]                            
Dividends paid       $ 1.4   $ 1.4                
Stock options                            
Class of Stock [Line Items]                            
Antidilutive securities (in shares)                 0 566,894 0 269,311    
Common stock equivalents                            
Class of Stock [Line Items]                            
Dilutive common stock equivalents (in shares)                 3,004,777 1,180,858 2,804,451 1,556,898    
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   $ 0.609375              
Preferred stock, dividend rate (as percent)     9.75%   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   $ 0.503125              
Preferred stock, dividend rate (as percent)     8.05%   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   $ 0.523438              
Preferred stock, dividend rate (as percent)     8.375%   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 (amount less than for RSUs)                 $ 0.5   $ 1.3      
Unrecognized stock-based compensation expense                 $ 6.5   $ 6.5      
Unrecognized stock-based compensation expense, period for recognition                     3 years 11 months      
Dilutive common stock equivalents (in shares)                 0 0 0 0    
Stock Compensation Plan | 2018 Omnibus Incentive Plan                            
Class of Stock [Line Items]                            
Number of shares available for grant (in shares)                           6,697,710
Number of shares available for grant, annual limitation (in shares)                           1,339,542
Restricted Stock Units (RSUs)                            
Class of Stock [Line Items]                            
Stock-based compensation expense (amount less than for RSUs)                 $ 0.1   $ 0.1      
Unrecognized stock-based compensation expense                 $ 0.1   $ 0.1      
Unrecognized stock-based compensation expense, period for recognition                     11 months      
Dilutive common stock equivalents (in shares)                 0 0 0 0    
Restricted Stock Units (RSUs) | Directors                            
Class of Stock [Line Items]                            
Shares granted (in shares)   26,178                        
Vesting period   1 year                        
Fair value at grant date (as USD per share)   $ 5.73