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Accumulated Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Dec. 31, 2012
Comprehensive Income Loss Note [Abstract]  
Changes in other comprehensive income
    Before Tax Net of
    Tax (Benefit) Tax
(U.S. dollars in thousands) Amount Expense Amount
Year Ended December 31, 2012:         
Unrealized gains on investments:         
 Unrealized gains (losses) arising during year $985,543 $(7,348) $992,891
 Less reclassifications for (losses) realized in income  14,098  (24,137)  38,235
Net unrealized gains (losses) on investments $971,445  16,789  954,656
Change in value cash flow hedge  439  -  439
Change in underfunded pension liability  (9,985)  -  (9,985)
Foreign currency translation adjustments  (6,448)  1,715  (8,163)
Change in accumulated other comprehensive income $955,451 $18,504 $936,947
            
Year Ended December 31, 2011:         
Unrealized gains on investments:         
 Unrealized gains (losses) arising during year $384,495 $51,775 $332,720
 Less reclassifications for (losses) realized in income  (188,359)  (9,927)  (178,432)
Net unrealized gains (losses) on investments $572,854  61,702  511,152
Change in value cash flow hedge  439  -  439
Change in underfunded pension liability  (2,622)  -  (2,622)
Foreign currency translation adjustments  (25,598)  1,102  (26,700)
Change in accumulated other comprehensive income $545,073 $62,804 $482,269
            
Year Ended December 31, 2010:         
Unrealized gains on investments:         
 Unrealized gains (losses) arising during year $968,891 $36,122 $932,769
 Less reclassifications for (losses) realized in income  (270,803)  (5,369)  (265,434)
Net unrealized gains (losses) on investments $1,239,694  41,491  1,198,203
Change in value cash flow hedge  439  -  439
Change in net unrealized gain on future policy benefit reserves  (3,714)  -  (3,714)
Change in underfunded pension liability  (2,619)  -  (2,619)
Foreign currency translation adjustments  54,641  3,688  50,953
Change in accumulated other comprehensive income $1,288,441 $45,179 $1,243,262
Components of acculumated other comprehensive income (loss)
(U.S. dollars in thousands) 2012 2011 2010
Accumulated unrealized gains (losses) on investments, net of tax $1,597,823  710,447  238,751
OTTI losses recognized in other comprehensive income, net of tax  (121,371)  (188,651)  (228,107)
Accumulated foreign currency translation  69,391  77,554  104,254
Accumulated underfunded pension liability  (27,506)  (17,521)  (14,899)
Accumulated cash flow hedge  1,674  1,235  796
Total $1,520,011 $583,064 $100,795