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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Derivative Instruments Abstract  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value
     June 30, 2011  December 31, 2010
      Notional Carrying Value/Fair Value   Notional Carrying Value/Fair Value
      Amount  Assets  Liabilities   Amount  Assets  Liabilities
Derivatives not designated as                  
 hedging instruments:                  
 Interest rate swaps(1)$ 2,623,012 $ 37,001 $ 29,041  $ 2,302,853 $ 20,042 $ 17,132
 Financial futures(1)  174,096   --   --    210,295   --   --
 Foreign currency forwards(1)  39,700   5,706   --    39,700   5,924   --
 Consumer Price index (“CPI”) swaps(1)  126,091   1,667   --    120,340   1,491   --
 Credit default swaps(1)  612,500   2,210   4,201    392,500   2,429   131
 Equity options(1)  253,803   44,326   --    33,041   5,043   --
 Embedded derivatives in:                  
  Modified coinsurance or funds                  
   withheld arrangements(2)  --   --   173,160    --   --   274,220
  Indexed annuity products(3)  --   86,029   758,431    --   75,431   668,951
  Variable annuity products(3)  --   --   45,741    --   --   52,534
 Total non-hedging derivatives  3,829,202   176,939   1,010,574    3,098,729   110,360   1,012,968
                       
Derivatives designated as                  
 hedging instruments:                  
 Interest rate swaps(1)  21,783   --   1,984    21,783   --   1,718
 Foreign currency swaps(1)  615,323   --   66,425    615,323   --   45,749
 Total hedging derivatives  637,106   --   68,409    637,106   --   47,467
Total derivatives$ 4,466,308 $ 176,939 $ 1,078,983  $ 3,735,835 $ 110,360 $ 1,060,435
                       
(1)Carried on the Company’s condensed consolidated balance sheets in other invested assets or other liabilities, at fair value.
(2)Embedded liability is included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value.
(3)Embedded liability is included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. Embedded asset is included on the condensed consolidated balance sheets in reinsurance ceded receivables.
                       
Net Derivatives Gains Losses Recognized On Fair Value Derivatives And Related Hedged Items
Type of Fair Value Hedge   Hedged Item  Gains (Losses) Recognized for Derivatives  Gains (Losses) Recognized for Hedged Items  Ineffectiveness Recognized in Investment Related Gains (Losses)
             
For the three months ended June 30, 2011:       
Interest rate swaps  Fixed rate fixed maturities $ (489) $ 694 $ 205
             
For the three months ended June 30, 2010:       
Interest rate swaps  Fixed rate fixed maturities $ (877) $ 1,046 $ 169
             
For the six months ended June 30, 2011:       
Interest rate swaps  Fixed rate fixed maturities $ (266) $ 596 $ 330
             
For the six months ended June 30, 2010:       
Interest rate swaps  Fixed rate fixed maturities $ (1,200) $ 1,500 $ 300
Derivatives Hedging Instruments In Net Investment Hedging Relationships
   Derivative Gains (Losses) Deferred in AOCI
   For the three months ended For the six months ended
Type of NIFO Hedge (1) (2) 2011 2010 2011  2010
              
Foreign currency swaps $ (9,916) $ 16,846 $ (25,020) $ 8,766
              
(1)There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
(2)There was no ineffectiveness recognized for the Company's hedges of net investments in foreign operations.
Changes In Estimated Fair Value Related To Embedded Derivatives
  Three months ended Six months ended
  June 30, June 30,
  2011 2010 2011 2010
Embedded derivatives in modified coinsurance or funds withheld           
 arrangements and variable annuity contracts included in investment           
 related gains (losses)$ (15,335) $ (108,422) $ 107,854 $ 21,383
After the associated amortization of DAC and taxes, the related           
 amounts included in net income  (3,626)   (7,172)   24,358   13,407
Amounts related to embedded derivatives in equity-indexed annuities           
 included in benefits and expenses  (32,077)   (14,950)   (73,348)   (3,222)
After the associated amortization of DAC and taxes, the related           
 amounts included in net income  (13,192)   (3,952)   (49,842)   (5,184)
Derivative Instruments Gain Loss By Income Statement Location
Non-hedging Derivatives         
            
A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s income statement for the three and six months ended June 30, 2011 and 2010 is as follows (dollars in thousands):
            
       Gain (Loss) for the Three Months Ended
       June 30,
Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2011 2010
Interest rate swaps Investment related gains (losses), net $ 25,343 $ 87,115
Financial futures Investment related gains (losses), net   (2,873)   32,823
Foreign currency forwards Investment related gains (losses), net   595   1,447
CPI swaps Investment related gains (losses), net   503   108
Credit default swaps Investment related gains (losses), net   988   (4,060)
Equity options Investment related gains (losses), net   3,919   127
Embedded derivatives in:         
 Modified coinsurance or funds withheld        
  arrangements Investment related gains (losses), net   10,525   32,512
 Indexed annuity products Policy acquisition costs and other insurance      
     expenses   4,026   2,596
 Indexed annuity products Interest credited   (36,101)   (17,546)
 Variable annuity products Investment related gains (losses), net   (25,860)   (140,934)
Total non-hedging derivatives    $ (18,935) $ (5,812)
            
       Gain (Loss) for the Six Months Ended
       June 30,
Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2011 2010
Interest rate swaps Investment related gains (losses), net $ 14,613 $ 98,455
Financial futures Investment related gains (losses), net   (14,296)   21,077
Foreign currency forwards Investment related gains (losses), net   (260)   618
CPI swaps Investment related gains (losses), net   1,315   1,032
Credit default swaps Investment related gains (losses), net   1,880   (3,284)
Equity options Investment related gains (losses), net   (650)   127
Embedded derivatives in:         
 Modified coinsurance or funds withheld        
  arrangements Investment related gains (losses), net   101,060   155,147
 Indexed annuity products Policy acquisition costs and other insurance      
     expenses   12,119   1,161
 Indexed annuity products Interest credited   (85,466)   (4,383)
 Variable annuity products Investment related gains (losses), net   6,794   (133,763)
Total non-hedging derivatives    $ 37,109 $ 136,187
Credit Risk
   June 30, 2011 December 31, 2010  
Estimated fair value of derivatives in net asset (liability) position$ (10,741) $ (29,801)  
 Securities pledged to counterparties as collateral(1)  60,337   48,223  
 Cash pledged from counterparties as collateral(2)  (18,310)   (10,300)  
 Securities pledged from counterparties as collateral(3)  (30,253)   (1,781)  
Net credit exposure$ 1,033 $ 6,341  
          
Margin account related to exchange-traded futures(2)$ 11,379 $ 16,285  
          
(1)Consists of U.S. Treasury securities, included in other invested assets.     
(2)Included in cash and cash equivalents     
(3)Consists of U.S. Treasury securities.