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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Instruments [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value
     June 30, 2012  December 31, 2011
      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)$ 2,875,588 $ 344,157 $ 188,142  $ 2,748,317 $ 184,842 $ 18,702
 Financial futures(1)  245,481   --   --    277,814   --   --
 Foreign currency forwards(1)  44,400   3,275   --    24,400   4,560   --
 Consumer price index swaps(1)  101,455   388   --    101,069   766   --
 Credit default swaps(1)  644,500   990   7,812    649,500   1,313   10,949
 Equity options(1)  710,461   94,300   --    510,073   90,106   --
 Synthetic guaranteed investment contracts                  
  ("GICs")(1)  1,003,914   --   --    --   --   --
 Embedded derivatives in:                  
  Modified coinsurance or funds                  
   withheld arrangements(2)  --   --   375,337    --   --   361,456
  Indexed annuity products(3)  --   4,416   733,655    --   4,945   751,523
  Variable annuity products(3)  --   --   205,272    --   --   276,718
 Total non-hedging derivatives  5,625,799   447,526   1,510,218    4,311,173   286,532   1,419,348
                       
Derivatives designated as                  
 hedging instruments:                  
 Interest rate swaps(1)  56,465   1,044   325    56,250   133   960
 Foreign currency swaps(1)  646,653   236   23,390    621,578   286   23,996
 Total hedging derivatives  703,118   1,280   23,715    677,828   419   24,956
Total derivatives$ 6,328,917 $ 448,806 $ 1,533,933  $ 4,989,001 $ 286,951 $ 1,444,304
                       
(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 six months ended June 30, 2011:       
Interest rate swaps  Fixed rate fixed maturities $ (266) $ 596 $ 330
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 Three months ended Six months ended
 June 30, 2012 June 30, 2012
Accumulated other comprehensive income (loss), balance beginning of period$ (862) $ (828)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges   464   787
Amounts reclassified to investment related gains (losses), net  --   --
Amounts reclassified to investment income  (321)   (678)
Accumulated other comprehensive income (loss), balance end of period$ (719) $ (719)
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Derivatives in Cash Flow Hedging Relationships Amount of Gains (Losses) Deferred in AOCI on Derivatives Amount and Location of Gains (Losses) Reclassified from AOCI into Income (Loss) Amount and Location of Gains (Losses) Recognized in Income (Loss) on Derivatives
  (Effective Portion) (Effective Portion) (Ineffective Portion and Amounts Excluded from Effectiveness Testing)
     Investment Related Gains (Losses) Investment Income Investment Related Gains (Losses) Investment Income
For the three months ended June 30, 2012:         
Interest rate swaps $ 464 $ -- $ 321 $ 27 $ --
                
For the six months ended June 30, 2012:         
Interest rate swaps $ 787 $ -- $ 678 $ 3 $ --
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) 2012 2011 2012  2011
              
Foreign currency swaps $ 6,642 $ (9,916) $ (4,003) $ (25,020)
              
(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,
  2012 2011 2012 2011
Embedded derivatives in modco or funds withheld arrangements included           
 in investment related gains$ (4,453) $ 10,525 $ (13,881) $ 101,060
After the associated amortization of DAC and taxes, the related amounts included in net income  (2,598)   3,788   (665)   22,971
             
Embedded derivatives in variable annuity contracts included in investment related gains  (74,929)   (25,860)   71,446   6,794
After the associated amortization of DAC and taxes, the related amounts included in net income  (16,175)   (7,414)   (1,093)   1,387
Amounts related to embedded derivatives in equity-indexed annuities included           
 in benefits and expenses  27,138   (32,077)   7,399   (73,348)
After the associated amortization of DAC and taxes, the related amounts included in net income  15,378   (13,192)   29,248   (49,842)
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, 2012 and 2011 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) 2012 2011
Interest rate swaps Investment related gains (losses), net $ 73,342 $ 25,343
Financial futures Investment related gains (losses), net   11,074   (2,873)
Foreign currency forwards Investment related gains (losses), net   516   595
CPI swaps Investment related gains (losses), net   (1,431)   503
Credit default swaps Investment related gains (losses), net   (4,795)   988
Equity options Investment related gains (losses), net   3,367   3,919
Embedded derivatives in:         
 Modified coinsurance or funds withheld        
  arrangements Investment related gains (losses), net   (4,453)   10,525
 Indexed annuity products Policy acquisition costs and other insurance      
     expenses   859   4,026
 Indexed annuity products Interest credited   26,279   (36,101)
 Variable annuity products Investment related gains (losses), net   (74,929)   (25,860)
Total non-hedging derivatives    $ 29,829 $ (18,935)
            
       Gain (Loss) for the Six Months Ended
       June 30,
Type of Non-hedging Derivative Income Statement Location of Gain (Loss) 2012 2011
Interest rate swaps Investment related gains (losses), net $ 25,990 $ 14,613
Financial futures Investment related gains (losses), net   (6,335)   (14,296)
Foreign currency forwards Investment related gains (losses), net   (1,093)   (260)
CPI swaps Investment related gains (losses), net   (2,233)   1,315
Credit default swaps Investment related gains (losses), net   7,019   1,880
Equity options Investment related gains (losses), net   (34,616)   (650)
Embedded derivatives in:         
 Modified coinsurance or funds withheld        
  arrangements Investment related gains (losses), net   (13,881)   101,060
 Indexed annuity products Policy acquisition costs and other insurance      
     expenses   (139)   12,119
 Indexed annuity products Interest credited   7,538   (85,466)
 Variable annuity products Investment related gains (losses), net   71,446   6,794
Total non-hedging derivatives    $ 53,696 $ 37,109
Credit Risk
   June 30, 2012 December 31, 2011  
Estimated fair value of derivatives in net asset position$ 224,721 $ 227,399  
 Securities pledged to counterparties as collateral(1)  22,654   27,052  
 Cash pledged from counterparties as collateral(2)  (226,384)   (241,480)  
 Securities pledged from counterparties as collateral(3)  (31,404)   (997)  
Net credit exposure$ (10,413) $ 11,974  
          
Margin account related to exchange-traded futures(2)$ 9,564 $ 18,153  
          
(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.