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Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2011
Share Repurchase Program/Comprehensive Income [Abstract]  
Schedule of comprehensive income
                         
     Years Ended December 31,  
     2011     2010     2009  

Net income

  $ 195,621     $ 273,371     $ 149,279  

Other comprehensive income:

                       

Unrealized gains on held-to-maturity investment portfolio at time of transfer to available-for-sale, net of tax

    —         —         3,030  

Unrealized gain (loss) on available-for-sale securities, net of tax

    11,315       (727     2,346  
   

 

 

   

 

 

   

 

 

 

Total change

    11,315       (727     5,376  
   

 

 

   

 

 

   

 

 

 

Comprehensive income

  $ 206,936     $ 272,644     $ 154,655