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Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2011
Comprehensive Income  
Schedule of Details Supporting Comprehensive Income
     Three months ended
June 30,
     Six months ended
June 30,
 
     2011      2010      2011      2010  
     (in thousands)  

Net income

   $ 460,287       $ 340,076       $ 775,463       $ 598,844   

Net unrealized investment gains and other, net of tax

     80,222         88,434         68,446         116,293   
                                   

Comprehensive income, net of tax

   $ 540,509       $ 428,510       $ 843,909       $ 715,137