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Other Comprehensive Income (Loss) (Tables)
3 Months Ended
Mar. 31, 2013
Other Comprehensive Income (Loss) [Abstract]  
Components of other comprehensive income (loss) pretax and after-tax
                         
    For the Three Months
Ended March 31, 2013
 
    Pretax     Tax     After-tax  

Net unrealized losses on available-for-sale investments arising during the periods

  $ —       $ —       $ —    
   

 

 

   

 

 

   

 

 

 

Other comprehensive income (loss)

  $ —       $ —       $ —