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Investments (Tables)
 12 Months Ended
Dec. 31, 2011
Investments [Abstract]  
Summary Of Investments [Table Text Block]
  2011 2010 
Fixed maturity securities, available-for-sale$16,200,950 $14,304,597 
Mortgage loans on real estate 991,731  885,811 
Policy loans 1,260,400  1,228,418 
Funds withheld at interest 5,410,424  5,421,952 
Short-term investments 88,566  118,387 
Other invested assets 1,012,541  707,403 
Cash and cash equivalents 962,870  463,661 
 Total cash and invested assets$25,927,482 $23,130,229 
Investment Income [Table Text Block]
Investment Income, Net of Related Expenses
            
Major categories of investment income, net of related expenses consist of the following (dollars in thousands):
            
 2011 2010 2009  
Fixed maturity securities available-for-sale$ 757,726 $ 715,817 $ 609,917   
Mortgage loans on real estate  55,931   51,186   46,652   
Policy loans  66,621   72,743   68,213   
Funds withheld at interest  388,694   385,762   382,351   
Short-term investments  2,378   4,968   4,692   
Other invested assets  39,939   33,187   28,777   
Investment revenue  1,311,289   1,263,663   1,140,602   
Investment expense  (30,092)   (25,003)   (18,140)   
Investment income, net of related expenses$ 1,281,197 $ 1,238,660 $ 1,122,462   
Gain (Loss) on Investments [Table Text Block]
Investment Related Gains (Losses), Net         
               
Investment related gains (losses), net consist of the following (dollars in thousands):      
               
    2011 2010 2009  
Fixed maturity and equity securities available for sale:            
 Other-than-temporary impairment losses on fixed maturities $ (30,873) $ (31,920) $ (128,834)   
 Portion of loss recognized in accumulated other            
  comprehensive income (before taxes)   3,924   2,045   16,045   
 Net other-than-temporary impairment losses on fixed            
  maturity securities recognized in earnings   (26,949)   (29,875)   (112,789)   
 Impairment losses on equity securities    (4,116)   (32)   (11,058)   
 Gain on investment activity   132,045   100,957   113,872   
 Loss on investment activity    (26,996)   (28,730)   (72,987)   
Other impairment losses   (10,238)   (5,976)   (8,471)   
Derivatives and other, net   (99,802)   175,686   125,581   
Net gains (losses) $ (36,056) $ 212,030 $ 34,148   
Roll Forward Of Cumulative Credit Loss Component Of Otti Income Loss [Table Text Block]
 2011 2010 2009(1)
Balance, beginning of period$ 47,291 $ 47,905 $ 17,132
Initial impairments - credit loss OTTI recognized on securities not previously impaired  8,349   7,359   7,853
Additional impairments - credit loss OTTI recognized on securities previously impaired  9,059   9,346   22,920
Credit loss impairments previously recognized on securities which were sold during the period  (752)   (17,319)   --
Balance, end of period$ 63,947 $ 47,291 $ 47,905
         
(1) Represents nine month period due to adoption of amended general accounting principles on April 1, 2009.      
Available-for-sale Securities [Table Text Block]
                  Other-than-
                  temporary
December 31, 2011:Amortized Unrealized Unrealized Estimated % of  impairments
   Cost Gains Losses Fair 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%   

                  Other-than-
                  temporary
December 31, 2010:Amortized Unrealized Unrealized Estimated % of  impairments
   Cost Gains Losses Fair Value Total in AOCI
Available-for-sale:                 
 Corporate securities$ 6,384,262 $ 426,933 $ 100,751 $ 6,710,444  46.9% $ --
 Canadian and Canadian provincial                  
  governments  2,386,428   675,132   3,993   3,057,567  21.4    --
 Residential mortgage-backed securities  1,443,892   55,765   26,580   1,473,077  10.3    (1,650)
 Asset-backed securities  440,752   12,001   61,544   391,209  2.7    (4,963)
 Commercial mortgage-backed securities  1,353,279   81,839   97,265   1,337,853  9.4    (10,010)
 U.S. government and agencies  199,129   7,795   708   206,216  1.4    --
 State and political subdivisions  170,479   2,098   8,117   164,460  1.2    --
 Other foreign government, supranational and                  
  foreign government-sponsored enterprises  966,801   11,574   14,604   963,771  6.7    --
  Total fixed maturity securities$ 13,345,022 $ 1,273,137 $ 313,562 $ 14,304,597  100.0% $ (16,623)
                    
Non-redeemable preferred stock$ 100,718 $ 4,130 $ 5,298 $ 99,550  71.0%   
Other equity securities  34,832   6,100   271   40,661  29.0    
  Total equity securities$ 135,550 $ 10,230 $ 5,569 $ 140,211  100.0%   
Investments Classified By Contractual Maturity Date [Table Text Block]
   Amortized Fair 
   Cost Value 
Available-for-sale:      
 Due in one year or less$178,548 $181,033 
 Due after one year through five years 2,479,316  2,559,352 
 Due after five year through ten years 3,868,653  4,195,878 
 Due after ten years 4,811,166  6,393,243 
 Asset and mortgage-backed securities 2,845,197  2,871,444 
  Total $14,182,880 $16,200,950 
Fixed Maturity Holdings Industry Types [Table Text Block]
December 31, 2011:    Estimated      
   Amortized Cost  Fair Value % of Total    
Finance$ 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%   
             
             
December 31, 2010:    Estimated      
   Amortized Cost  Fair Value % of Total    
Finance$ 2,447,486 $ 2,501,158  37.3%   
Industrial  3,065,088   3,281,255  48.9    
Utility  868,382   924,304  13.7    
Other  3,306   3,727  0.1    
 Total$ 6,384,262 $ 6,710,444  100.0%   
Sovereign Fixed Maturity Holdings By Country [Table Text Block]
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% 
            
            
December 31, 2010:    Estimated    
    Amortized Cost  Fair Value % of Total  
Australia$ 350,178 $ 343,716  54.0% 
United Kingdom  84,650   86,126  13.5  
South Africa  43,173   43,991  6.9  
Germany  30,920   30,602  4.8  
Qatar  26,464   27,549  4.3  
South Korea  22,812   23,378  3.7  
United Arab Emirates  14,545   15,067  2.4  
Other  62,930   66,205  10.4  
  Total$ 635,672 $ 636,634  100.0% 
Non Sovereign Fixed Maturity And Equity Securities In European Peripheral Region [Table Text Block]
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% 

December 31, 2010:    Estimated    
     Amortized Cost  Fair Value % of Total  
Financial institutions:         
 Ireland$ 12,626 $ 12,626  15.9% 
 Spain  27,747   23,448  29.5  
  Total financial institutions  40,373   36,074  45.4  
             
Other:         
 Italy  2,745   2,675  3.3  
 Spain  40,147   40,753  51.3  
  Total other  42,892   43,428  54.6  
   Total$ 83,265 $ 79,502  100.0% 
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block]
  December 31, 2011 December 31, 2010
    Gross       Gross   
  Number of Unrealized    Number of Unrealized   
  Securities Losses % of Total Securities Losses % of Total
Less than 20%833 $ 131,155 44.8% 908 $ 146,404 45.9%
20% or more for less than six months44   51,503 17.6  14   18,114 5.7 
20% or more for six months or greater63   109,828 37.6  106   154,613 48.4 
 Total940 $ 292,486 100.0% 1,028 $ 319,131 100.0%
Fair Value And Investments In Debt And Equity Securities Disclosures [Table Text Block]
   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
                    
 Total number of securities in an                 
  unrealized loss position  546      394      940   

   Less than 12 months 12 months or greater Total
      Gross    Gross    Gross
December 31, 2010:Estimated Unrealized Estimated Unrealized Estimated Unrealized
   Fair Value Losses Fair Value Losses Fair Value Losses
Investment grade securities:                 
 Corporate securities$ 1,020,784 $ 30,438 $ 329,109 $ 58,539 $ 1,349,893 $ 88,977
 Canadian and Canadian provincial                 
  governments   127,908   3,993   --   --   127,908   3,993
 Residential mortgage-backed securities  195,406   4,986   105,601   13,607   301,007   18,593
 Asset-backed securities  23,065   570   131,172   38,451   154,237   39,021
 Commercial mortgage-backed securities  132,526   4,143   109,158   29,059   241,684   33,202
 U.S. government and agencies  11,839   708   --   --   11,839   708
 State and political subdivisions  68,229   2,890   31,426   5,227   99,655   8,117
 Other foreign government, supranational and                  
  foreign government-sponsored enterprises  462,272   6,694   82,815   7,910   545,087   14,604
  Total investment grade securities  2,042,029   54,422   789,281   152,793   2,831,310   207,215
                    
Non-investment grade securities:                 
 Corporate securities  58,420   1,832   91,205   9,942   149,625   11,774
 Residential mortgage-backed securities  1,162   605   38,206   7,382   39,368   7,987
 Asset-backed securities  --   --   23,356   22,523   23,356   22,523
 Commercial mortgage-backed securities  --   --   89,170   64,063   89,170   64,063
  Total non-investment grade securities  59,582   2,437   241,937   103,910   301,519   106,347
  Total fixed maturity securities$ 2,101,611 $ 56,859 $ 1,031,218 $ 256,703 $ 3,132,829 $ 313,562
                    
 Non-redeemable preferred stock$ 15,987 $ 834 $ 28,549 $ 4,464 $ 44,536 $ 5,298
 Other equity securities  6,877   271   318   --   7,195   271
  Total equity securities$ 22,864 $ 1,105 $ 28,867 $ 4,464 $ 51,731 $ 5,569
                    
 Total number of securities in an                 
  unrealized loss position  520      508      1,028   
Disclosure Of Real Estate Holdings By Property Type [Table Text Block]
   2011 2010
   Recorded Investment Percentage of Total Recorded Investment Percentage of Total
Property type:       
 Apartment$ 124,674  12.4% $ 93,042  10.4%
 Retail  335,745  33.5    256,304  28.7 
 Office building  264,584  26.4    263,063  29.5 
 Industrial  200,762  20.0    227,868  25.6 
 Other commercial  77,759  7.7    51,773  5.8 
Total$ 1,003,524  100.0% $ 892,050 100.0%
Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block]
   2011 2010
   Recorded Investment Percentage of Total Recorded Investment Percentage of Total
        
Pacific$ 269,922  26.9% $ 232,940  26.1%
South Atlantic  233,534  23.3    217,637  24.4 
Mountain  116,224  11.6    99,145  11.1 
Middle Atlantic  86,590  8.6    83,843  9.4 
West North Central  69,789  7.0    70,279  7.9 
East North Central  92,861  9.2    58,955  6.6 
West South Central  58,506  5.8    51,351  5.7 
East South Central  40,767  4.1    41,721  4.7 
New England  35,331  3.5    36,179  4.1 
 Total$ 1,003,524  100.0% $ 892,050 100.0%
Disclosure of Real Estate Holdings Classified By Contractual Maturity Date [Table Text Block]
The maturities of the mortgage loans, gross of valuation allowances, as of December 31, 2011 and 2010 are as follows (dollars in thousands):
          
           
   2011 2010   
Due one year through five years$ 493,027 $ 412,359   
Due after five years  299,252   399,100   
Due after ten years  211,245   80,591   
  Total$ 1,003,524 $ 892,050   
Mortgage Loan Internal Credit Risk Grade [Table Text Block]
Internal credit risk grade:2011 2010   
 High investment grade$ 252,333 $ 205,127   
 Investment grade  526,608   585,818   
 Average  105,177   38,152   
 Watch list  91,037   44,208   
 In or near default  28,369   18,745   
  Total$ 1,003,524 $ 892,050   
Schedule Of Analysis Of Past Due Financing Receivables [Table Text Block]
The age analysis of the Company's past due recorded investment in mortgage loans, gross of valuation allowances, as of December 31, 2011 and 2010 are as follows (dollars in thousands):
          
           
   2011 2010   
31-60 days past due$ 21,800 $ --   
61-90 days past due  --   --   
Greater than 90 days  20,316   15,555   
 Total past due  42,116   15,555   
Current  961,408   876,495   
  Total$ 1,003,524 $ 892,050   
           
Recorded Investment And Allowance For Credit Losses [Table Text Block]
The following table presents the recorded investment in mortgage loans, by method of evaluation of credit loss, and the related valuation allowances, by type of credit loss, at (dollars in thousands):
            
            
   December 31,    
   2011 2010   
Mortgage loans:         
 Evaluated individually for credit losses$ 60,904 $ 35,646    
 Evaluated collectively for credit losses  942,620   856,404    
  Mortgage loans, gross of valuation allowances  1,003,524   892,050    
            
Valuation allowances:         
 Specific for credit losses  8,188   6,239    
 Non-specifically identified credit losses  3,605   --    
  Total valuation allowances  11,793   6,239    
            
  Mortgage loans, net of valuation allowances$ 991,731 $ 885,811    
Allowance For Loan And Lease Losses Provision For Loss Net [Table Text Block]
Information regarding the Company's loan valuation allowances for mortgage loans as of December 31, 2011, 2010 and 2009 are as follows (dollars in thousands):
           
            
   2011 2010 2009 
Balance, beginning of period$ 6,239 $ 5,784 $ 526 
Charge-offs  (3,947)   --   (2,371) 
Provision  9,501   455   7,629 
Balance, end of period$ 11,793 $ 6,239 $ 5,784 
Impaired Financing Receivables [Table Text Block]
  Unpaid Principal Balance Recorded Investment Related Allowance Carrying Value
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
             
December 31, 2010:           
Impaired mortgage loans with no valuation allowance recorded$ 16,901 $ 16,901 $ -- $ 16,901
Impaired mortgage loans with valuation allowance recorded  18,745   18,745   6,239   12,506
 Total impaired mortgage loans$ 35,646 $ 35,646 $ 6,239 $ 29,407

The Company's average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the years ended December 31, 2011 and 2010 (dollars in thousands):
            
             
  2011 2010
 Average Investment(1) Interest Income Average Investment(1) Interest Income
Impaired mortgage loans with no valuation allowance recorded$ 14,877 $ 630 $ 19,253 $ 525
Impaired mortgage loans with valuation allowance recorded  27,712   418   21,925   295
 Total$ 42,589 $ 1,048 $ 41,178 $ 820
             
(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]
   December 31,   
   2011 2010   
Equity securities$ 113,900 $ 140,211   
Limited partnerships  251,315   214,105   
Structured loans  281,022   229,583   
Derivatives  257,050   34,929   
Other  109,254   88,575   
 Total other invested assets$ 1,012,541 $ 707,403