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Preferred Stock (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Mar. 31, 2009
Jun. 30, 2014
Dec. 31, 2013
Apr. 28, 2014
Series B Stock
Jun. 30, 2014
Series B Stock
Jun. 30, 2014
Series B Stock
item
Dec. 31, 2013
Series B Stock
Mar. 31, 2009
Series B Stock
Jun. 30, 2014
Warrants
Mar. 31, 2009
Warrants
Common and 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%        
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  
Proceeds from the Treasury $ 73,000,000                  
Fair value               68,200,000   4,800,000
Number of quarters in which if the Company did not pay dividends, will allow the holder the right to appoint representatives to the Company's board of directors           6        
Payments for repurchase of preferred stock       24,300,000 24,300,000          
Repurchase price percentage of liquidation value (as a percent)       94.75% 94.75%          
Shares redeemed (in shares)       25,669 25,669          
Preferred stock   $ 47,331,000 $ 72,942,000       $ 72,900,000