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Comprehensive Income (Tables)
3 Months Ended
Mar. 31, 2013
Comprehensive Income [Abstract]  
Components Of Accumulated Other Comprehensive Income [Text Block]
    Accumulated Other Comprehensive Income (Loss), Net of Income Tax
     Accumulated  Unrealized      
     Currency  Appreciation  Pension and   
     Translation  (Depreciation)  Postretirement   
     Adjustments  of Investments(1)  Benefits  Total
Balance, December 31, 2012 $ 267,475 $ 1,877,657 $ (36,230) $ 2,108,902
 Other comprehensive income (loss) before reclassifications   (14,105)   (112,711)   99   (126,717)
 Amounts reclassified from AOCI   --   (6,171)   726   (5,445)
Net current-period other comprehensive income (loss)   (14,105)   (118,882)   825   (132,162)
Balance, March 31, 2013 $ 253,370 $ 1,758,775 $ (35,405) $ 1,976,740

    Accumulated Other Comprehensive Income (Loss), Net of Income Tax
     Accumulated  Unrealized      
     Currency  Appreciation  Pension and   
     Translation  (Depreciation)  Postretirement   
     Adjustments  of Investments(1)  Benefits  Total
Balance, December 31, 2011 $ 229,795 $ 1,419,318 $ (30,960) $ 1,618,153
 Change in component during the period   24,080   (30,721)   290   (6,351)
Balance, March 31, 2012 $ 253,875 $ 1,388,597 $ (30,670) $ 1,611,802
               
(1)Includes cash flow hedges. See Note 5 - "Derivative Instruments" for additional information on cash flow hedges.
Reclassification Out Of Accumulated Other Comprehensive Income [Table Text Block]
    Amount  
    Reclassified  
Details about AOCI Components  from AOCI Affected Line Item in Statement of Income
Unrealized gains and losses on available-for-sale securities $ 10,348 Investment related gains (losses), net
Gains and losses on cash flow hedge - interest rate swap   305 Investment income
Deferred policy acquisition costs attributed to unrealized gains and losses(1)   (1,548)  
     9,105 Total before tax
     (2,934) Tax expense
   $ 6,171 Net of tax
       
Amortization of unrealized pension and postretirement benefits:     
 Prior service cost(2) $ (94)  
 Actuarial gains/(losses)(2)   (1,023)  
     (1,117) Total before tax
     391 Tax benefit
   $ (726) Net of tax
       
Total reclassifications for the period $ 5,445 Net of tax
       
(1)This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred policy Acquisition Costs” of the 2012 Annual Report for additional details.
(2)These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.