Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details)

v3.19.2
SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jul. 30, 2019
May 07, 2019
Mar. 13, 2019
Jun. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]          
Options issued (in shares)       695,652  
Series B preferred stock          
Subsequent Event [Line Items]          
Dividends declared per share of preferred stock (in dollars per share)   $ 0.609375 $ 0.609375    
Preferred stock, dividend rate (as percent)   9.75% 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 $ 0.503125    
Preferred stock, dividend rate (as percent)   8.05% 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 $ 0.523438    
Preferred stock, dividend rate (as percent)   8.375% 8.375% 8.375% 8.375%
Subsequent event          
Subsequent Event [Line Items]          
Dividends declared $ 1.4        
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%