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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2016
Mar. 31, 2009
Preferred Stock          
Dividends paid on preferred stock   $ (2,417)      
Preferred stock, Shares authorized 300,000     300,000  
Series B Stock          
Preferred Stock          
Fair value         $ 68,200
Shares redeemed (in shares)     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         $ 4,800