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Warrants and Stock Repurchase - Additional Information (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Mar. 13, 2015
Mar. 10, 2015
Jul. 01, 2013
Class of Stock [Line Items]                
Warrants received (in shares) 13,201 13,201   21,605        
Warrants repurchased (in shares) 300 8,333            
Warrants repurchased $ 0.7 $ 15.9            
Remaining authorized repurchase amount $ 138.5 $ 138.5            
Senior Secured Notes | 6.875% Senior Secured Notes                
Class of Stock [Line Items]                
Interest rate (percent) 6.875% 6.875% 6.875%   6.875% 6.875% 6.875%  
GETCO                
Class of Stock [Line Items]                
Warrants received (in shares)               24,300