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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Mar. 31, 2009
Preferred Stock          
Preferred stock, Shares authorized 300,000     300,000  
Series B Stock          
Preferred Stock          
Fair value         $ 68.2
Shares redeemed (in shares)   73,000 73,000    
Warrants          
Preferred Stock          
Warrants, term 10 years        
Warrants to purchase the Company's common stock, initially authorized (in shares) 815,339        
Warrants, exercise price (in dollars per share) $ 13.43        
Fair value         $ 4.8