Annual report pursuant to Section 13 and 15(d)

SUBSEQUENT EVENTS (Details)

v3.6.0.2
SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 27, 2017
Jan. 03, 2017
Jul. 31, 2016
May 31, 2016
Dec. 31, 2015
Mar. 31, 2007
Oct. 31, 2005
Mar. 31, 2003
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]                    
Dividends payable         $ 8,929       $ 8,949 $ 8,929
Series B Preferred Stock                    
Subsequent Event [Line Items]                    
Preferred stock, dividend rate (as percent)               9.75% 9.75% 9.75%
Series C Preferred Stock                    
Subsequent Event [Line Items]                    
Preferred stock, dividend rate (as percent)             8.05%   8.05% 8.05%
Series D Preferred Stock                    
Subsequent Event [Line Items]                    
Preferred stock, dividend rate (as percent)           8.375%     8.375% 8.375%
Directors                    
Subsequent Event [Line Items]                    
Shares of common stock issued for compensation (in shares)     21,798 57,740 18,798          
Subsequent Event                    
Subsequent Event [Line Items]                    
Dividends payable $ 1,400                  
Subsequent Event | Series B Preferred Stock                    
Subsequent Event [Line Items]                    
Dividends declared (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 (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 (in dollars per share) $ 0.523438                  
Preferred stock, dividend rate (as percent) 8.375%                  
Subsequent Event | Directors                    
Subsequent Event [Line Items]                    
Shares of common stock issued for compensation (in shares)   18,074