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Series B Preferred Stock (“Series B Stock”) (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Mar. 31, 2009
Sep. 30, 2014
Dec. 31, 2013
Aug. 15, 2014
Series B Stock
May 15, 2014
Series B Stock
Apr. 28, 2014
Series B Stock
May 31, 2014
Series B Stock
Jun. 30, 2014
Series B Stock
Sep. 30, 2014
Series B Stock
item
Dec. 31, 2013
Series B Stock
Mar. 31, 2009
Series B Stock
Sep. 30, 2014
Warrants
Mar. 31, 2009
Warrants
Series B Preferred Stock (“Series B 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 of Dividends   11,323,000   1,100,000 10,300,000   10,300,000            
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           $ 47,300,000 $ 72,900,000