Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Narrative (Details)

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EQUITY AND EARNINGS PER SHARE EQUITY AND EARNINGS PER SHARE - Narrative (Details)
1 Months Ended 12 Months Ended 13 Months Ended
Nov. 12, 2018
Apr. 11, 2018
Sep. 30, 2018
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Oct. 31, 2017
shares
May 31, 2017
shares
Jan. 31, 2017
shares
Jul. 31, 2016
shares
May 31, 2016
shares
Mar. 31, 2007
USD ($)
shares
Oct. 31, 2005
USD ($)
shares
Mar. 31, 2003
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
shares
Sep. 30, 2018
shares
Dec. 05, 2018
right
$ / shares
May 25, 2018
shares
Mar. 31, 2010
shares
Class of Stock [Line Items]                                      
Dilutive common stock equivalents (in shares)                             2,078,515        
Share price (in dollars per share) | $ / shares                         $ 3.92            
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.01                 0.01 $ 0.01          
Preferred stock liquidation preference (in dollars per share) | $ / shares       $ 25.00                 $ 25.00 $ 25.00          
Other investments | $       $ 21,135,000                 $ 22,613,000 $ 21,135,000          
Real Estate Investment with a Non-Controlling Interest                                      
Class of Stock [Line Items]                                      
Other investments | $                         $ 0            
Common Stock                                      
Class of Stock [Line Items]                                      
Number of rights for each common stock outstanding | right                                 1    
Series E Preferred Stock                                      
Class of Stock [Line Items]                                      
Preferred stock, par value (in dollars per share) | $ / shares                                 $ 0.01    
Purchase price per unit (in dollars per share) | $ / shares                                 $ 28.00    
Series B Cumulative Redeemable Preferred Stock                                      
Class of Stock [Line Items]                                      
Issuance of preferred stock (in shares)                       2,500,000              
Issuance of preferred stock | $                       $ 62,500,000              
Preferred stock, dividend rate (as percent)                       9.75% 9.75% 9.75%          
Preferred stock liquidation preference (in dollars per share) | $ / shares                       $ 25.00              
Cost incurred with stock issuance | $                       $ 2,400,000              
Preferred stock, shares outstanding (in shares)       1,347,321                 1,347,321 1,347,321         1,347,321
Series C Cumulative Redeemable Preferred Stock                                      
Class of Stock [Line Items]                                      
Issuance of preferred stock (in shares)                     1,600,000                
Issuance of preferred stock | $                     $ 40,000,000                
Preferred stock, dividend rate (as percent)                     8.05%   8.05% 8.05%          
Increased dividend rate of preferred stock, if delisting occurs (as percent)                     9.05%                
Cost incurred with stock issuance | $                     $ 1,500,000                
Preferred stock, shares outstanding (in shares)       496,000                 496,000 496,000         496,000
Series D Cumulative Redeemable Preferred Stock                                      
Class of Stock [Line Items]                                      
Issuance of preferred stock (in shares)                   2,000,000                  
Issuance of preferred stock | $                   $ 50,000,000                  
Preferred stock, dividend rate (as percent)                   8.375%     8.375% 8.375%          
Increased dividend rate of preferred stock, if delisting occurs (as percent)                   9.375%                  
Cost incurred with stock issuance | $                   $ 1,800,000                  
Preferred stock, shares outstanding (in shares)       620,000                 620,000 620,000         620,000
Stock Option                                      
Class of Stock [Line Items]                                      
Dilutive common stock equivalents (in shares)                         0 0 2,078,515        
Vesting period 3 years                                    
Stock-based compensation expense | $                         $ 2,200,000            
Unrecognized stock-based compensation expense, stock options | $                         $ 13,100,000            
Weighted average period of recognition for stock-based compensation expense                         2 years 4 months            
RSUs                                      
Class of Stock [Line Items]                                      
Dilutive common stock equivalents (in shares)                         0 0 0        
Vesting period                         1 year            
Stock-based compensation expense | $                         $ 100,000            
Unrecognized stock-based compensation expense, stock options | $                         $ 200,000            
Weighted average period of recognition for stock-based compensation expense                         8 months 15 days            
Omnibus Incentive Plan 2018 | Stock Compensation Plan                                      
Class of Stock [Line Items]                                      
Shares available for grants (in shares)                         1,146,422         6,697,710  
Shares available for grant, annual limitation (in shares)                                   1,339,542  
Director Stock Program                                      
Class of Stock [Line Items]                                      
Number of fully vested shares available for grant (as percent)   20.00%                                  
Issued to the independent directors                                      
Class of Stock [Line Items]                                      
Shares of common stock issued for compensation (in shares)       13,538 30,822 90,366 18,074 21,798 57,740                    
Issuance of common stock (in shares)     50,000                                
Non-Employee Director | RSUs                                      
Class of Stock [Line Items]                                      
Instruments other than options, granted (in shares)                         54,641            
Instruments other than options, granted, weighted average grant date fair value (in dollars per share) | $ / shares                         $ 5.02            
Non-Employee Director | Director Stock Program                                      
Class of Stock [Line Items]                                      
Shares of common stock issued for compensation (in shares)                               8,333      
Service period   30 days                                  
Sale of Stock, Number of Shares Issued in Transaction     41,667                                
Stock Option                                      
Class of Stock [Line Items]                                      
Potentially dilutive common stock equivalents excluded from diluted EPS calculation due to loss                         2,718,704 1,749,596          
Antidilutive common stock equivalents (in shares)                         88,023 201,430 309,024