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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

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