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Subsequent Events (Details) - $ / shares
May 03, 2017
Apr. 17, 2017
Jan. 19, 2017
Aug. 25, 2016
Series A preferred stock        
Preferred Stock Dividend Declared        
Dividend rate (as a percent)     8.00% 8.00%
Liquidation preference (in dollars per share)     $ 50.00 $ 50.00
Dividend declared (in dollars per share)     $ 1.00  
Series A preferred stock | Subsequent Event        
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    
Dividend declared, cash portion (in dollars per share)   0.83    
Dividend declared, common stock portion (in dollars per share)   $ 0.17    
Average volume-weighted price per share percentage (as a percent)   95.00%    
Average volume-weighted price per share percentage, consecutive days   5 days    
Beneficial owner | JVL | Subsequent Event        
Preferred Stock Dividend Declared        
Shelf registration (in shares) 17,868,330      
Beneficial owner | Metalmark | Series A preferred stock | Subsequent Event        
Preferred Stock Dividend Declared        
Shelf registration (in shares) 181,600