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Comprehensive Income
6 Months Ended
Jun. 30, 2011
Share Repurchase Program/Comprehensive Income [Abstract]  
Comprehensive Income
13.  Comprehensive Income
 
Differences between net income and total comprehensive income resulted from net unrealized gains on the investment portfolio as follows:
 
                                         
          Three Months Ended
    Six Months Ended
 
          June 30,     June 30,  
          2011     2010     2011     2010  
 
Net income
          $ 44,294     $ 67,213     $ 114,771     $ 109,395  
Other comprehensive income:
                                       
Unrealized gain on available-for-sale securities, net of tax
            5,955       702       5,355       944  
                                         
Comprehensive income
          $ 50,249     $ 67,915     $ 120,126     $ 110,339