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Future Policy Benefit Reserve (Tables)
12 Months Ended
Dec. 31, 2012
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]  
Components of future policy benefit reserve
Year ended December 31      
(U.S. dollars in thousands) 2012 2011
Traditional Life  805,558  812,628
Annuities  4,006,487  4,032,766
Total future policy benefit reserves  4,812,045  4,845,394