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Stock Repurchase (Details) (USD $)
 1 Months Ended 6 Months Ended
Mar. 28, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Sep. 28, 2012
Sep. 21, 2012
Stock Repurchase (Textual) [Abstract]            
Stock repurchase in cash   $ 0 $ 25,432,000      
Stock repurchase from issued shares of series A nonconvertible   0   0    
Stock Repurchase (Additional Textual) [Abstract]            
Repurchase common stock held by promoter, one 2,485,929          
Repurchase common stock held by promoter, two 500,000          
Repurchase share price per share $ 20          
Total consideration 59,700,000          
Non-Voting Redeemable Preferred Stock with a liquidation preference   $ 1,000        
Professional and legal fees 514,000          
Redemption of outstanding shares of Series A Nonconvertible, Non-Voting Redeemable Preferred Stock           34,800,000
Decrease in dividend obligation after redemption of preferred stock         870,000  
Preferred stock redemption period   6 months        
Series A Nonconvertible Non Voting Redeemable Preferred Stock [Member]
            
Stock Repurchase (Textual) [Abstract]            
Stock repurchase from issued shares of series A nonconvertible   34,800        
Cash [Member]
            
Stock Repurchase (Textual) [Abstract]            
Stock repurchase in cash   $ 24,900,000