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
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
Aug. 01, 2017
Jul. 31, 2017
May 04, 2017
Apr. 28, 2017
Feb. 27, 2017
May 31, 2017
Jan. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Stock [Line Items]                          
Dividends paid     $ 1.4   $ 1.4                
Dilutive common stock equivalents (in shares)                 0 2,342,093 0 2,064,570  
Stock options                          
Class of Stock [Line Items]                          
Potentially dilutive securities (in shares)                 566,894 267,706 269,311 335,725  
Common stock equivalents                          
Class of Stock [Line Items]                          
Dilutive common stock equivalents (in shares)                 1,180,858 2,342,093 1,556,898 2,064,570  
Issued to the independent directors                          
Class of Stock [Line Items]                          
Shares issued to independent directors (in shares)             90,366 18,074          
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%