Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended
May 02, 2018
Apr. 30, 2018
Apr. 10, 2018
Mar. 06, 2018
Mar. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]            
Dividends declared         $ 1,395  
Series B preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share)       $ 0.609375    
Preferred stock, dividend rate       9.75% 9.75% 9.75%
Series C preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share)       $ 0.503125    
Preferred stock, dividend rate       8.05% 8.05% 8.05%
Series D preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share)       $ 0.523438    
Preferred stock, dividend rate       8.375% 8.375% 8.375%
Subsequent event            
Subsequent Event [Line Items]            
Dividends declared $ 1,400          
Subsequent event | Series B preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share) $ 0.609375          
Preferred stock, dividend rate 9.75%          
Subsequent event | Series C preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share) $ 0.503125          
Preferred stock, dividend rate 8.05%          
Subsequent event | Series D preferred stock            
Subsequent Event [Line Items]            
Dividends declared per share of preferred stock (in dollars per share) $ 0.523438          
Preferred stock, dividend rate 8.375%          
Manager | Subsequent event            
Subsequent Event [Line Items]            
Options granted by manager (in shares)     1.2      
Value of options granted     $ 3,600      
Hurricane Irma | Florida | Subsequent event            
Subsequent Event [Line Items]            
Payments expected to be received from insurer   $ 3,000        
Stock options            
Subsequent Event [Line Items]            
Vesting period         1 year