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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2009
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Preferred Stock              
Proceeds from the Treasury       $ 73,000      
Payments for Repurchase of Preferred Stock and Preference Stock     $ 24,300        
Dividends paid on preferred stock           $ (2,417) $ (12,390)
Shares redeemed (in shares) 31,553 15,778          
Series B Stock              
Preferred Stock              
Period for payment of cumulative dividends using the initial cumulative dividend rate         5 years    
Cumulative dividends, initial rate for the first five years (as a percent)         5.00%    
Cumulative dividends rate (as a percent)         9.00%    
Fair value       68,200      
Shares redeemed (in shares)     25,669        
Repurchase price percentage of liquidation value (as a percent)     94.75%        
Preferred stock             $ 47,300
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      
Company directors              
Preferred Stock              
Payments for Repurchase of Preferred Stock and Preference Stock     $ 1,400