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Organization and Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2012
Retrospective Effect of Change in Accounting Principle, Tabular Presentation by Financial Statement Line Item, Amount after Application [Abstract]  
Schedule Of New Accounting Pronouncements And Changes In Accounting Principles Text Block
     Three months ended September 30, 2011
      As Reported  Adjustments  As Amended
Benefits and Expenses:         
Policy acquisition costs and other insurance expenses $ 149,228 $ 15,144 $ 164,372
             
Income before income taxes   171,540   (15,144)   156,396
Provision for income taxes   24,155   (2,361)   21,794
Net income $ 147,385 $ (12,783) $ 134,602
             
Earnings per share:         
Basic earnings per share $2.00 $ (0.18) $1.82
Diluted earnings per share $1.98 $ (0.17) $1.81
             
             
             
             
             
             
             
             
             
     Nine months ended September 30, 2011
      As Reported  Adjustments  As Amended
Benefits and Expenses:         
Policy acquisition costs and other insurance expenses $ 741,663 $ 43,475 $ 785,138
             
Income before income taxes   613,795   (43,475)   570,320
Provision for income taxes   172,706   (9,852)   162,854
Net income $ 441,089 $ (33,623) $ 407,466
             
Earnings per share:         
Basic earnings per share $5.99 $ (0.46) $5.53
Diluted earnings per share $5.94 $ (0.45) $5.49
             
      Nine months ended September 30, 2011
      As Reported  Adjustments  As Amended
Cash Flows from Operating Activities:         
Net Income $ 441,089 $ (33,623) $ 407,466
 Change in operating assets and liabilities         
  Deferred policy acquisition costs   (104,267)   43,475   (60,792)
  Deferred income taxes   68,059   (9,852)   58,207