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Subsequent Events - Preferred Stock Dividend Declared (Details) - Series A preferred stock - $ / shares
Oct. 09, 2017
Jul. 13, 2017
Apr. 17, 2017
Jan. 19, 2017
Aug. 25, 2016
Preferred Stock Dividend Declared          
Dividend rate (as a percent)   8.00% 8.00% 8.00% 8.00%
Liquidation preference (in dollars per share)   $ 50.00 $ 50.00 $ 50.00 $ 50.00
Dividend declared (in dollars per share)   $ 1.00 $ 1.00 $ 1.00  
Average volume-weighted price per share percentage (as a percent)   95.00% 95.00%    
Average volume-weighted price per share percentage, consecutive days   5 days 5 days    
Subsequent events          
Preferred Stock Dividend Declared          
Dividend rate (as a percent) 8.00%        
Liquidation preference (in dollars per share) $ 50.00        
Dividend declared (in dollars per share) $ 1.00        
Average volume-weighted price per share percentage (as a percent) 95.00%        
Average volume-weighted price per share percentage, consecutive days 5 days