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
 3 Months Ended 12 Months Ended
May 04, 2017
Feb. 27, 2017
Mar. 31, 2017
Dec. 31, 2016
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 (as percent)   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 (as percent)   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 (as percent)   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 (as percent) 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 (as percent) 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 (as percent) 8.375%