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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2012
Derivatives Disclosure [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
   June 30, 2012 December 31, 2011
(U.S. dollars in thousands)  Asset Derivative Notional Amount  Asset Derivative Fair Value (1)  Liability Derivative Notional Amount  Liability Derivative Fair Value (1)  Asset Derivative Notional Amount  Asset Derivative Fair Value (1)  Liability Derivative Notional Amount  Liability Derivative Fair Value (1)
Derivatives designed as hedging instruments:                        
 Interest rate contracts (2)  $ 156,254 $ 116,881 $ - $ - $ 156,271 $ 109,761 $ - $ -
 Foreign exchange contracts   1,932,505   57,315   724,842   (5,883)   2,033,428   25,387   457,892   (4,518)
Total derivatives designed as hedging instruments $ 2,088,759 $ 174,196 $ 724,842 $ (5,883) $ 2,189,699 $ 135,148 $ 457,892 $ (4,518)
                          
Derivatives not designed as hedging instruments:                        
Investment Related Derivatives:                        
 Interest rate exposure  $ 60,802 $ 2,229 $ 32,642 $ (163) $ 70,978 $ 1,946 $ 55,033 $ (43)
 Foreign exchange exposure    27,223   255   59,666   (754)   232,422   3,759   384,592   (11,737)
 Credit exposure    91,250   1,624   374,013   (15,015)   172,500   5,271   449,513   (13,986)
 Financial market exposure    43,578   718   15,476   (597)   23,874   615   14,321   -
Financial Operations Derivatives: (3)                        
 Credit exposure (2)    -   -   58,668   (3,626)   -   -   81,678   (10,288)
Other Non-Investment Derivatives:                        
 Guaranteed minimum income benefit contract    -   -   70,352   (21,404)   -   -   78,777   (22,490)
 Modified coinsurance funds withheld contract   73,929   -   -   -   77,200   -   -   -
Total derivatives not designed as hedging instruments $ 296,782 $ 4,826 $ 610,817 $ (41,559) $ 576,974 $ 11,591 $ 1,063,914 $ (58,544)

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(1)       Derivative instruments in an asset or liability position are included within Other assets or Other liabilities, respectively, in the balance sheet on a net basis where the Company has both a legal right of offset and the intentions to settle the contracts on a net basis.

(2)       At June 30, 2012 and December 31, 2011, the Company held net cash collateral related to these derivative positions of $124.7 million and $77.1 million, respectively. The collateral balance is included within Cash and cash equivalents and the corresponding liability to return the collateral has been offset against the derivative asset within the balance sheet as appropriate under the netting agreement.

(3)       Financial operations derivatives represent interests in variable interest entities as described in Note 10, “Variable Interest Entities.”
Gain (loss) recognized in income attributable to risk, hedged items [Text Block]
  Hedged Items - Amount of Gain/(Loss)
  Recognized in Income Attributable to Risk
           Ineffective
  Gain/(Loss)       Portion of
Derivatives Designated as Fair Value Hedges:Recognized       Hedging
Three Months Ended June 30, 2012in Income on Deposit Fixed Maturity Relationship -
(U.S. dollars in thousands)Derivative Liabilities Investments Gain/(Loss)
Interest rate exposure$7,270         
Foreign exchange exposure 7,297         
Total$14,567 $(9,789) $(6,972) $(2,194)
             
Three Months Ended June 30, 2011           
(U.S. dollars in thousands)           
Interest rate exposure$5,726         
Foreign exchange exposure (877)         
Total$4,849 $(6,672) $866 $(957)
             
Six Months Ended June 30, 2012           
(U.S. dollars in thousands)           
Interest rate exposure$1,813         
Foreign exchange exposure (7,803)         
Total$(5,990) $(6,182) $7,539 $(4,633)
             
Six Months Ended June 30, 2011           
(U.S. dollars in thousands)           
Interest rate exposure$4,852         
Foreign exchange exposure (21,303)         
Total$(16,451) $(4,291) $21,006 $264
Schedule Of Settlement of Fair Values Hedges [Table Text Block]
  Fair Value Hedges - Notes Fair Value Hedges - Deposit
  Payable and Debt Liabilities
Settlement of Fair Value Hedges - SummaryJune 30, June 30,
(U.S. dollars in thousands, except years)2012 2011  2012 2011
Cumulative reduction to interest expense$12,996 $7,432 $12,763 $5,646
Remaining balance$8,628 $14,192 $136,722 $143,839
Weighted average years remaining to maturity 2.2  2.9  32.4  35.0
Schedule of Derivative Instruments Designated as Hedges of the Net Investment in a Foreign Operation [Table Text Block]
Derivative Instruments Designated as Hedges of theThree Months Ended Six Months Ended
Net Investment in a Foreign Operation - SummaryJune 30, June 30,
(U.S. dollars in thousands)2012 2011 2012 2011
Weighted average of U.S. dollar equivalent of foreign denominated net assets$1,872,407 $1,656,083 $1,882,904 $1,542,979
Derivative gains (losses) (1)$56,777 $(27,797) $18,905 $(69,206)

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(1)       Derivative gains (losses) from derivative instruments designated as hedges of the net investment in a foreign operation are recorded in the cumulative translation adjustment account within AOCI for each period.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance (Not Formally Designated as Hedges) [Text Block]
Net Realized and Unrealized Gains (Losses)Three Months Ended Six Months Ended
on Derivative InstrumentsJune 30, June 30,
(U.S. dollars in thousands)2012 2011 2012 2011
Investment Related Derivatives:           
 Interest rate exposure$(83) $(4,319) $617 $(4,151)
 Foreign exchange exposure 683  11,014  329  17,451
 Credit exposure 6,323  (12,693)  2,624  (13,659)
 Financial market exposure (5,969)  (32)  (2,025)  837
Financial Operations Derivatives:           
 Credit exposure -  124  143  306
Other Non-Investment Derivatives:           
 Contingent credit facility -  (2,053)  -  (4,083)
 Guaranteed minimum income benefit contract (929)  (1,130)  1,086  1,179
 Modified coinsurance funds withheld contract (2,131)  (904)  (1,739)  (5,527)
Total derivatives not designated as hedging instruments$(2,106) $(9,993) $1,035 $(7,647)
Amount of gain (loss) recognized in income from ineffective portion of fair value hedges (2,194)  (957)  (4,633)  264
Net realized and unrealized gains (losses) on derivative instruments$(4,300) $(10,950) $(3,598) $(7,383)
Schedule Of Financial Operations Derivatives Credit Exposure [Table Text Block]
Financial Operations Derivatives - Credit Exposure Summary:June 30, December 31,
(U.S. dollars in thousands, except term to maturity)2012 2011
Principal outstanding$56,052 $78,425
Interest outstanding 2,616  3,253
Aggregate outstanding exposure$58,668 $81,678
Total liability recorded$3,626 $10,288
Weighted average contractual term to maturity 4.8 years  5.0 years
Underlying obligations credit rating BBB-  BB
Summary of Contingent Credit Features [Table Text Block
Contingent Credit Features - Summary:June 30, December 31,
(U.S. dollars in thousands)2012 2011
Aggregate fair value of derivative agreements with downgrade provisions in a net liability position$10,152 $15,763
Collateral posted to counterparty$- $809