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Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2012
Basis of Presentation [Abstract]  
Summary of financial statement amounts previously reported
                 
    As of December 31,  
    2011     2010  

Total shareholders’ equity

                

As previously reported

   $ 1,086,926     $ 880,007  

Effect of change in accounting principle, net of taxes:

                

Retained earnings

     (34,425 )      (34,447 ) 

Accumulated other comprehensive income (loss), net of taxes (Net unrealized gains and losses on fixed maturities and equity securities)

     2,852       1,531  
   

 

 

    

 

 

  

As adjusted

   $ 1,055,353     $ 847,091  
   

 

 

    

 

 

  
     
    Three Months Ended     Nine Months Ended  
    September 30, 2011     September 30, 2011  

Net income

                

As previously reported

   $ 23,128     $ 37,252  

Effect of change in accounting principle, net of taxes

     509       341  
   

 

 

    

 

 

  

As adjusted

   $ 23,637     $ 37,593