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Investments (Details 8) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months $ 5,440,708 $ 1,445,262
Gross Unrealized Losses - Less than 12 months 235,266 22,324
Estimated Fair Value - 12 months or greater 312,720 414,211
Gross Unrealized Losses - 12 months or greater 69,329 109,930
Estimated Fair Value 5,753,428 1,859,473
Gross Unrealized Losses 304,595 132,254
Equity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 100,668 90,951
Gross Unrealized Losses - Less than 12 months 6,137 1,186
Estimated Fair Value - 12 months or greater 1 5,679
Gross Unrealized Losses - 12 months or greater 2 118
Estimated Fair Value 100,669 96,630
Gross Unrealized Losses 6,139 1,304
Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 465,383 203,105
Gross Unrealized Losses - Less than 12 months 13,146 4,040
Estimated Fair Value - 12 months or greater 117,097 142,099
Gross Unrealized Losses - 12 months or greater 35,804 66,970
Estimated Fair Value 582,480 345,204
Gross Unrealized Losses 48,950 71,010
Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 4,975,325 1,242,157
Gross Unrealized Losses - Less than 12 months 222,120 18,284
Estimated Fair Value - 12 months or greater 195,623 272,112
Gross Unrealized Losses - 12 months or greater 33,525 42,960
Estimated Fair Value 5,170,948 1,514,269
Gross Unrealized Losses 255,645 61,244
Corporate securities | Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 366,159 181,168
Gross Unrealized Losses - Less than 12 months 11,452 3,170
Estimated Fair Value - 12 months or greater 40,425 39,123
Gross Unrealized Losses - 12 months or greater 6,603 5,501
Estimated Fair Value 406,584 220,291
Gross Unrealized Losses 18,055 8,671
Corporate securities | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 3,229,715 786,203
Gross Unrealized Losses - Less than 12 months 161,032 13,276
Estimated Fair Value - 12 months or greater 89,098 108,187
Gross Unrealized Losses - 12 months or greater 12,531 17,386
Estimated Fair Value 3,318,813 894,390
Gross Unrealized Losses 173,563 30,662
Canadian and Canadian provincial governments | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 138,843 12,349
Gross Unrealized Losses - Less than 12 months 9,162 174
Estimated Fair Value - 12 months or greater 0 0
Gross Unrealized Losses - 12 months or greater 0 0
Estimated Fair Value 138,843 12,349
Gross Unrealized Losses 9,162 174
Residential mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 53,715 15,199
Gross Unrealized Losses - Less than 12 months 1,007 80
Estimated Fair Value - 12 months or greater 2,359 2,633
Gross Unrealized Losses - 12 months or greater 565 347
Estimated Fair Value 56,074 17,832
Gross Unrealized Losses 1,572 427
Residential mortgage-backed securities | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 210,336 22,288
Gross Unrealized Losses - Less than 12 months 9,553 97
Estimated Fair Value - 12 months or greater 14,822 19,394
Gross Unrealized Losses - 12 months or greater 2,643 3,199
Estimated Fair Value 225,158 41,682
Gross Unrealized Losses 12,196 3,296
Asset-backed securities | Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 25,233 3,421
Gross Unrealized Losses - Less than 12 months 376 26
Estimated Fair Value - 12 months or greater 30,434 31,938
Gross Unrealized Losses - 12 months or greater 7,875 18,815
Estimated Fair Value 55,667 35,359
Gross Unrealized Losses 8,251 18,841
Asset-backed securities | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 220,912 59,119
Gross Unrealized Losses - Less than 12 months 4,719 449
Estimated Fair Value - 12 months or greater 51,673 96,179
Gross Unrealized Losses - 12 months or greater 5,567 9,508
Estimated Fair Value 272,585 155,298
Gross Unrealized Losses 10,286 9,957
Commercial mortgage-backed securities | Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 19,324 3,317
Gross Unrealized Losses - Less than 12 months 198 764
Estimated Fair Value - 12 months or greater 43,879 68,405
Gross Unrealized Losses - 12 months or greater 20,761 42,307
Estimated Fair Value 63,203 71,722
Gross Unrealized Losses 20,959 43,071
Commercial mortgage-backed securities | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 227,712 89,507
Gross Unrealized Losses - Less than 12 months 9,172 797
Estimated Fair Value - 12 months or greater 18,893 29,181
Gross Unrealized Losses - 12 months or greater 6,455 7,974
Estimated Fair Value 246,605 118,688
Gross Unrealized Losses 15,627 8,771
U.S. government and agencies | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 191,973 7,272
Gross Unrealized Losses - Less than 12 months 2,344 24
Estimated Fair Value - 12 months or greater 4,037 0
Gross Unrealized Losses - 12 months or greater 109 0
Estimated Fair Value 196,010 7,272
Gross Unrealized Losses 2,453 24
State and political subdivisions | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 97,877 20,602
Gross Unrealized Losses - Less than 12 months 6,351 1,514
Estimated Fair Value - 12 months or greater 11,402 11,736
Gross Unrealized Losses - 12 months or greater 5,499 4,132
Estimated Fair Value 109,279 32,338
Gross Unrealized Losses 11,850 5,646
Other foreign government, supranational and foreign government-sponsored enterprises | Non-investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 952  
Gross Unrealized Losses - Less than 12 months 113  
Estimated Fair Value - 12 months or greater 0  
Gross Unrealized Losses - 12 months or greater 0  
Estimated Fair Value 952  
Gross Unrealized Losses 113  
Other foreign government, supranational and foreign government-sponsored enterprises | Investment grade securities | Fixed maturity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 657,957 244,817
Gross Unrealized Losses - Less than 12 months 19,787 1,953
Estimated Fair Value - 12 months or greater 5,698 7,435
Gross Unrealized Losses - 12 months or greater 721 761
Estimated Fair Value 663,655 252,252
Gross Unrealized Losses 20,508 2,714
Non-redeemable preferred stock | Equity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 30,787 5,577
Gross Unrealized Losses - Less than 12 months 1,745 52
Estimated Fair Value - 12 months or greater 1 5,679
Gross Unrealized Losses - 12 months or greater 2 118
Estimated Fair Value 30,788 11,256
Gross Unrealized Losses 1,747 170
Other equity securities | Equity securities
    
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]    
Estimated Fair Value - Less than 12 months 69,881 85,374
Gross Unrealized Losses - Less than 12 months 4,392 1,134
Estimated Fair Value - 12 months or greater 0 0
Gross Unrealized Losses - 12 months or greater 0 0
Estimated Fair Value 69,881 85,374
Gross Unrealized Losses $ 4,392 $ 1,134