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Derivatives (Tables)
9 Months Ended
Sep. 30, 2013
Disclosure - Derivatives [Abstract]  
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Text Block
                
     Asset Liability Net derivatives
     derivatives derivatives Net notional  
September 30, 2013 at fair value at fair value exposure Fair value
Foreign exchange forward contracts $4,188 $(5,470) $2,069,416 $(1,282)
Foreign currency option contracts  0  (821)  93,438  (821)
Futures contracts  0  (61,909)  4,527,222  (61,909)
Credit default swaps (protection purchased)  0  (231)  34,000  (231)
Credit default swaps (assumed risks)  49  0  5,000  49
Insurance-linked securities (1)  175  (390)  140,744  (215)
Total return swaps  0  (732)  7,657  (732)
Interest rate swaps (2)  150  (4,614)  60,080  (4,464)
TBAs  7,256  0  192,040  7,256
Total derivatives  $11,818 $(74,167)    $(62,349)
                
     Asset Liability Net derivatives
     derivatives derivatives Net notional  
December 31, 2012 at fair value at fair value exposure Fair value
Foreign exchange forward contracts $7,889 $(17,395) $2,170,914 $(9,506)
Foreign currency option contracts  1,410  (186)  133,377  1,224
Futures contracts  1,956  (1,352)  3,981,107  604
Credit default swaps (protection purchased)  6  (807)  55,000  (801)
Credit default swaps (assumed risks)  512  0  17,500  512
Insurance-linked securities (1)  0  (2,173)  135,964  (2,173)
Total return swaps  6,630  (546)  68,730  6,084
Interest rate swaps (2)  0  (7,880)  0  (7,880)
TBAs  115  (163)  155,760  (48)
Total derivatives  $18,518 $(30,502)    $(11,984)

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(1)       At September 30, 2013 and December 31, 2012, insurance-linked securities include a longevity swap for which the notional amount is not reflective of the overall potential exposure of the swap. As such, the Company has included the probable maximum loss under the swap within the net notional exposure as an approximation of the notional amount.

(2)       The Company enters into interest rate swaps to mitigate notional exposures on certain total return swaps and certain fixed maturities. Accordingly, the notional value of interest rate swaps on certain total return swaps is not presented separately in the table.

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
      For the three For the three For the nine For the nine
      months ended months ended months ended months ended
      September 30, 2013 September 30, 2012 September 30, 2013 September 30, 2012
Foreign exchange forward contracts  $17  $21,976  $(36,457)  $41,686 
Foreign currency option contracts   (799)   1,061   (4,639)   2,559 
Total included in net foreign exchange gains and losses   $(782)  $23,037  $(41,096)  $44,245 
                     
Futures contracts  $(30,233)  $(14,979)  $55,143  $(34,758) 
Credit default swaps (protection purchased)   (6)   (250)   (126)   (861) 
Credit default swaps (assumed risks)   7   398   122   1,709 
Insurance-linked securities   (110)   3,934   (660)   5,160 
Total return swaps   (1,762)   (773)   (5,421)   (1,242) 
Interest rate swaps   240   (200)   3,416   (402) 
TBAs  3,858   2,568   (5,839)   7,446 
Total included in net realized and unrealized                
 investment gains and losses  $(28,006)  $(9,302)  $46,635  $(22,948) 
                     
Total derivatives  $(28,788)  $13,735  $5,539  $21,297 
Offsetting Disclosures
       Gross Net amounts of Gross amounts not offset  
     Gross amounts assets/ liabilities in the balance sheet   
     amounts offset in the presented in the Financial Cash collateral  
September 30, 2013 recognized (1) balance sheet balance sheet instruments received/pledged  Net amount
Total derivative assets  $11,818 $0 $11,818 $1,739 $0 $13,557
                      
Total derivative liabilities  $(74,167) $0 $(74,167) $(1,739) $4,260 $(71,646)
                      
December 31, 2012                  
Total derivative assets  $18,518 $0 $18,518 $(12,051) $0 $6,467
                      
Total derivative liabilities  $(30,502) $0 $(30,502) $12,051 $0 $(18,451)

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(1)       Amounts include all derivative instruments, irrespective of whether there is a legally enforceable master netting arrangement in place.