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Investments (Tables)
 3 Months Ended
Mar. 31, 2012
Investments Abstract  
Summary of Investments
  March 31, 2012 December 31, 2011 
Fixed maturity securities, available-for-sale$16,794,057 $16,200,950 
Mortgage loans on real estate 1,040,733  991,731 
Policy loans 1,260,070  1,260,400 
Funds withheld at interest 5,472,532  5,410,424 
Short-term investments 75,425  88,566 
Other invested assets 867,507  1,012,541 
Cash and cash equivalents 873,933  962,870 
 Total cash and invested assets$26,384,257 $25,927,482 
Investment Income
Investment Income, Net of Related Expenses
       
Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
       
 Three months ended 
 March 31, 
 2012 2011 
Fixed maturity securities available-for-sale$ 191,418 $ 184,561 
Mortgage loans on real estate  14,965   13,734 
Policy loans  16,783   16,371 
Funds withheld at interest  115,014   153,060 
Short-term investments  988   925 
Other invested assets  11,322   9,698 
Investment revenue  350,490   378,349 
Investment expense  9,550   7,309 
Investment income, net of related expenses$ 340,940 $ 371,040 
Gain Loss On Investments
Investment Related Gains (Losses), Net   
         
Investment related gains (losses), net consist of the following (dollars in thousands):
         
    Three months ended
    March 31,
    2012 2011
Fixed maturities and equity securities available for sale:      
 Other-than-temporary impairment losses on fixed maturities $ (7,607) $ (1,556)
 Portion of loss recognized in accumulated other comprehensive income (before taxes)   (7,221)   --
 Net other-than-temporary impairment losses on fixed maturities recognized in earnings   (14,828)   (1,556)
 Impairment losses on equity securities    (839)   --
 Gain on investment activity   22,312   29,376
 Loss on investment activity    (7,504)   (6,914)
Other impairment losses and change in mortgage loan provision   (5,843)   576
Derivatives and other, net   50,222   102,138
Net gains $ 43,520 $ 123,620
RollForward Of Cumulative Credit Loss Component Of OTTI Income Loss
 Three months ended
2012 2011
Balance, beginning of period$ 63,947 $ 47,291
Initial impairments - credit loss OTTI recognized on securities not previously impaired  1,902   --
Additional impairments - credit loss OTTI recognized on securities previously impaired  8,720   658
Credit loss OTTI previously recognized on securities impaired to fair value during the period  (11,381)   --
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period  (952)   --
Balance, end of period$ 62,236 $ 47,949
Available For Sale Securities
                  Other-than-
            Estimated    temporary
March 31, 2012:Amortized Unrealized Unrealized Fair % of  impairments
   Cost Gains Losses Value Total in AOCI
Available-for-sale:                 
 Corporate securities$ 7,518,983 $ 671,100 $ 78,629 $ 8,111,454 48.3% $ --
 Canadian and Canadian provincial                 
  governments  2,610,735   1,229,402   797   3,839,340 22.9    --
 Residential mortgage-backed securities  1,075,073   72,598   9,443   1,138,228 6.8    (710)
 Asset-backed securities  448,688   11,390   45,551   414,527 2.5    (4,512)
 Commercial mortgage-backed securities  1,302,734   104,586   64,899   1,342,421 8.0    (6,118)
 U.S. government and agencies  257,928   22,500   1,335   279,093 1.6    --
 State and political subdivisions  191,113   27,873   4,982   214,004 1.3    --
 Other foreign government, supranational and                 
  foreign government-sponsored enterprises  1,409,605   49,908   4,523   1,454,990 8.6    --
  Total fixed maturity securities$ 14,814,859 $ 2,189,357 $ 210,159 $ 16,794,057 100.0% $ (11,340)
                    
Non-redeemable preferred stock$ 77,766 $ 4,963 $ 2,706 $ 80,023 81.6%   
Other equity securities  16,046   3,446   1,487   18,005 18.4    
  Total equity securities$ 93,812 $ 8,409 $ 4,193 $ 98,028 100.0%   

                  Other-than-
            Estimated    temporary
December 31, 2011:Amortized Unrealized Unrealized Fair % of  impairments
   Cost Gains Losses Value Total in AOCI
Available-for-sale:                 
 Corporate securities$ 6,931,958 $ 654,519 $ 125,371 $ 7,461,106  46.0% $ --
 Canadian and Canadian provincial                  
  governments  2,507,802   1,362,160   29   3,869,933  23.9    --
 Residential mortgage-backed securities  1,167,265   76,393   16,424   1,227,234  7.6    (1,042)
 Asset-backed securities  443,974   11,692   53,675   401,991  2.5    (5,256)
 Commercial mortgage-backed securities  1,233,958   87,750   79,489   1,242,219  7.7    (12,225)
 U.S. government and agencies  341,087   32,976   61   374,002  2.3    --
 State and political subdivisions  184,308   24,419   3,341   205,386  1.3    --
 Other foreign government, supranational and                 
  foreign government-sponsored enterprises  1,372,528   50,127   3,576   1,419,079  8.7    --
  Total fixed maturity securities$ 14,182,880 $ 2,300,036 $ 281,966 $ 16,200,950  100.0% $ (18,523)
                    
Non-redeemable preferred stock$ 82,488 $ 4,677 $ 8,982 $ 78,183  68.6%   
Other equity securities  35,352   1,903   1,538   35,717  31.4    
  Total equity securities$ 117,840 $ 6,580 $ 10,520 $ 113,900  100.0%   
Investments Classified By Contractual Maturity Date
   Amortized Fair 
   Cost Value 
Available-for-sale:      
 Due in one year or less$179,357 $180,864 
 Due after one year through five years 2,659,446  2,770,954 
 Due after five year through ten years 4,094,202  4,447,320 
 Due after ten years 5,055,359  6,499,742 
 Asset and mortgage-backed securities 2,826,495  2,895,177 
  Total $14,814,859 $16,794,057 
Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings
March 31, 2012:    Estimated      
   Amortized Cost  Fair Value % of Total    
Finance$ 2,578,694 $ 2,686,141  33.1%   
Industrial  3,751,858   4,109,403  50.7    
Utility  1,179,592   1,306,787  16.1    
Other  8,839   9,123  0.1    
  Total$ 7,518,983 $ 8,111,454  100.0%   
             
December 31, 2011:    Estimated      
   Amortized Cost  Fair Value % of Total    
Finance$ 2,411,175 $ 2,442,149  32.7%   
Industrial  3,402,099   3,760,187  50.4    
Utility  1,115,384   1,255,090  16.9    
Other  3,300   3,680  -    
 Total$ 6,931,958 $ 7,461,106  100.0%   
Sovereign Fixed Maturity Holdings By Country [Table Text Block]
March 31, 2012:    Estimated    
    Amortized Cost  Fair Value % of Total  
Australia$ 455,583 $ 462,177  37.9% 
Japan  199,435   203,543  16.7  
United Kingdom  121,984   132,406  10.8  
South Africa  59,393   60,381  5.0  
New Zealand  53,981   53,238  4.4  
Cayman Islands  48,374   51,807  4.2  
Germany  42,434   44,326  3.6  
Other  197,465   212,848  17.4  
   Total$ 1,178,649 $ 1,220,726  100.0% 
            
            
            
December 31, 2011:    Estimated    
    Amortized Cost  Fair Value % of Total  
Australia$ 437,713 $ 446,694  39.1% 
Japan  214,994   219,276  19.2  
United Kingdom  118,618   130,106  11.4  
Germany  72,926   75,741  6.6  
New Zealand  51,547   51,544  4.5  
South Africa  37,624   38,528  3.4  
South Korea  30,592   32,025  2.8  
Other  139,927   148,792  13.0  
  Total$ 1,103,941 $ 1,142,706  100.0% 
Non Sovereign Fixed Maturity And Equity Securities In European Peripheral Region [Table Text Block]
March 31, 2012:    Estimated    
     Amortized Cost  Fair Value % of Total  
Financial institutions:         
 Ireland$ 4,160 $ 4,569  6.6% 
 Spain  25,656   23,715  34.3  
  Total financial institutions  29,816   28,284  40.9  
             
Other:         
 Ireland  12,475   13,285  19.3  
 Italy  2,980   3,058  4.4  
 Spain  24,449   24,450  35.4  
  Total other  39,904   40,793  59.1  
   Total$ 69,720 $ 69,077  100.0% 

December 31, 2011:    Estimated    
     Amortized Cost  Fair Value % of Total  
Financial institutions:         
 Ireland$ 4,084 $ 4,397  5.9% 
 Spain  25,565   20,378  27.6  
  Total financial institutions  29,649   24,775  33.5  
             
Other:         
 Ireland  12,474   13,149  17.8  
 Italy  2,898   2,808  3.8  
 Spain  34,459   33,137  44.9  
  Total other  49,831   49,094  66.5  
   Total$ 79,480 $ 73,869  100.0% 
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures
  March 31, 2012 December 31, 2011
  Gross     Gross   
  Unrealized    Unrealized   
  Losses % of Total Losses % of Total
Less than 20%$92,037 42.9% $131,155 44.8%
20% or more for less than six months 9,986 4.7   51,503 17.6 
20% or more for six months or greater 112,329 52.4   109,828 37.6 
 Total$214,352 100.0% $292,486 100.0%
Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures
   Less than 12 months 12 months or greater Total
      Gross    Gross    Gross
March 31, 2012:Estimated Unrealized Estimated Unrealized Estimated Unrealized
   Fair Value Losses Fair Value Losses Fair Value Losses
Investment grade securities:                 
 Corporate securities$ 862,016 $ 21,354 $ 257,018 $ 39,896 $ 1,119,034 $ 61,250
 Canadian and Canadian provincial                 
  governments   28,422   797   --   --   28,422   797
 Residential mortgage-backed securities  73,291   1,148   49,221   6,875   122,512   8,023
 Asset-backed securities  90,691   2,241   96,052   24,491   186,743   26,732
 Commercial mortgage-backed securities  92,710   1,432   52,313   13,549   145,023   14,981
 U.S. government and agencies  87,486   1,335   --   --   87,486   1,335
 State and political subdivisions  27,839   3,462   12,020   1,520   39,859   4,982
 Other foreign government, supranational and                 
  foreign government-sponsored enterprises  221,491   2,401   17,336   2,122   238,827   4,523
  Total investment grade securities  1,483,946   34,170   483,960   88,453   1,967,906   122,623
                    
Non-investment grade securities:                 
 Corporate securities  147,646   9,931   47,308   7,448   194,954   17,379
 Residential mortgage-backed securities  3,851   167   14,434   1,253   18,285   1,420
 Asset-backed securities  11   30   25,023   18,789   25,034   18,819
 Commercial mortgage-backed securities  32,637   1,201   61,562   48,717   94,199   49,918
  Total non-investment grade securities  184,145   11,329   148,327   76,207   332,472   87,536
  Total fixed maturity securities$ 1,668,091 $ 45,499 $ 632,287 $ 164,660 $ 2,300,378 $ 210,159
                    
 Non-redeemable preferred stock$ 7,603 $ 484 $ 19,099 $ 2,222 $ 26,702 $ 2,706
 Other equity securities  20   183   5,537   1,304   5,557   1,487
  Total equity securities$ 7,623 $ 667 $ 24,636 $ 3,526 $ 32,259 $ 4,193

   Less than 12 months 12 months or greater Total
      Gross    Gross    Gross
December 31, 2011:Estimated Unrealized Estimated Unrealized Estimated Unrealized
   Fair Value Losses Fair Value Losses Fair Value Losses
Investment grade securities:                 
 Corporate securities$ 790,758 $ 40,180 $ 286,244 $ 63,117 $ 1,077,002 $ 103,297
 Canadian and Canadian provincial                 
  governments   3,094   29   --   --   3,094   29
 Residential mortgage-backed securities  128,622   3,549   58,388   10,382   187,010   13,931
 Asset-backed securities  101,263   3,592   93,910   29,036   195,173   32,628
 Commercial mortgage-backed securities  109,455   3,538   58,979   22,001   168,434   25,539
 U.S. government and agencies  1,764   61   --   --   1,764   61
 State and political subdivisions  21,045   1,845   12,273   1,268   33,318   3,113
 Other foreign government, supranational and                  
  foreign government-sponsored enterprises  148,416   1,085   16,588   2,491   165,004   3,576
  Total investment grade securities  1,304,417   53,879   526,382   128,295   1,830,799   182,174
                    
Non-investment grade securities:                 
 Corporate securities  212,795   10,852   47,310   11,222   260,105   22,074
 Residential mortgage-backed securities  23,199   712   10,459   1,781   33,658   2,493
 Asset-backed securities  2,363   940   21,275   20,107   23,638   21,047
 Commercial mortgage-backed securities  34,918   7,220   62,357   46,730   97,275   53,950
 State and political subdivisions  4,000   228   --   --   4,000   228
  Total non-investment grade securities  277,275   19,952   141,401   79,840   418,676   99,792
  Total fixed maturity securities$ 1,581,692 $ 73,831 $ 667,783 $ 208,135 $ 2,249,475 $ 281,966
                    
 Non-redeemable preferred stock$ 19,516 $ 4,478 $ 15,694 $ 4,504 $ 35,210 $ 8,982
 Other equity securities  1,662   602   5,905   936   7,567   1,538
  Total equity securities$ 21,178 $ 5,080 $ 21,599 $ 5,440 $ 42,777 $ 10,520
Mortgage Loan Internal Credit Risk Grade
Internal credit risk grade:March 31, 2012 December 31, 2011   
 High investment grade$ 295,266 $ 252,333   
 Investment grade  539,872   526,608   
 Average  93,324   105,177   
 Watch list  107,225   91,037   
 In or near default  19,696   28,369   
  Total$ 1,055,383 $ 1,003,524   
Schedule Of Analysis Of Past Due Financing Receivables
   March 31, 2012 December 31, 2011   
31-60 days past due$ 11,937 $ 21,800   
61-90 days past due  3,634   --   
Greater than 90 days  17,153   20,316   
 Total past due  32,724   42,116   
Current  1,022,659   961,408   
  Total$ 1,055,383 $ 1,003,524   
           
Recorded Investment And Allowance For Credit Losses
   March 31, 2012 December 31, 2011   
Mortgage loans:        
 Evaluated individually for credit losses$ 56,855 $ 60,904   
 Evaluated collectively for credit losses  998,528   942,620   
  Mortgage loans, gross of valuation allowances  1,055,383   1,003,524   
           
Valuation allowances:        
 Specific for credit losses  9,884   8,188   
 Non-specifically identified credit losses  4,766   3,605   
  Total valuation allowances  14,650   11,793   
           
  Mortgage loans, net of valuation allowances$ 1,040,733 $ 991,731   
Allowance For Mortgage Loan And Lease Losses Provision For Loss Net
   Three Months Ended March 31,  
   2012 2011    
Balance, beginning of period$ 11,793 $ 6,239      
Charge-offs  (2,193)   --      
Provision (release)  5,050   (575)      
Balance, end of period$ 14,650 $ 5,664      
Impaired Financing Receivables Table

  Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value
March 31, 2012:           
Impaired mortgage loans with no valuation allowance recorded$ 12,189 $ 11,646 $ - $ 11,646
Impaired mortgage loans with valuation allowance recorded  45,352   45,209   9,884   35,325
 Total impaired mortgage loans$ 57,541 $ 56,855 $ 9,884 $ 46,971
             
December 31, 2011:           
Impaired mortgage loans with no valuation allowance recorded$ 32,088 $ 31,496 $ -- $ 31,496
Impaired mortgage loans with valuation allowance recorded  29,724   29,408   8,188   21,220
 Total impaired mortgage loans$ 61,812 $ 60,904 $ 8,188 $ 52,716

  Three Months Ended
  March 31, 2012 March 31, 2011
  Average Investment(1) Interest Income Average Investment(1) Interest Income
Impaired mortgage loans with no valuation allowance recorded$ 21,571 $ 169 $ 17,751 $ 167
Impaired mortgage loans with valuation allowance recorded  37,308   308   18,741   118
 Total$ 58,879 $ 477 $ 36,492 $ 285
             
(1)Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.
Schedule Of Other Invested Assets [Table Text Block]
   March 31, 2012 December 31, 2011   
Equity securities$ 98,028 $ 113,900   
Limited partnerships  265,879   251,315   
Structured loans  245,246   281,022   
Derivatives  168,961   257,050   
Other  89,393   109,254   
 Total other invested assets$ 867,507 $ 1,012,541