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Investments (Fair Value and Losses by Investment Category and Legth of Time in a Loss Position) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 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 | $ 5,173,349 | $ 1,445,262
Gross Unrealized Losses - Less than 12 months | 246,893 | 22,324
Estimated Fair Value - 12 months or greater | 347,755 | 414,211
Gross Unrealized Losses - 12 months or greater | 64,583 | 109,930
Estimated Fair Value | 5,521,104 | 1,859,473
Gross Unrealized Losses | 311,476 | 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 | 89,489 | 90,951
Gross Unrealized Losses - Less than 12 months | 5,950 | 1,186
Estimated Fair Value - 12 months or greater | 17,029 | 5,679
Gross Unrealized Losses - 12 months or greater | 1,435 | 118
Estimated Fair Value | 106,518 | 96,630
Gross Unrealized Losses | 7,385 | 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 | 395,260 | 203,105
Gross Unrealized Losses - Less than 12 months | 13,715 | 4,040
Estimated Fair Value - 12 months or greater | 86,084 | 142,099
Gross Unrealized Losses - 12 months or greater | 23,263 | 66,970
Estimated Fair Value | 481,344 | 345,204
Gross Unrealized Losses | 36,978 | 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 | 4,778,089 | 1,242,157
Gross Unrealized Losses - Less than 12 months | 233,178 | 18,284
Estimated Fair Value - 12 months or greater | 261,671 | 272,112
Gross Unrealized Losses - 12 months or greater | 41,320 | 42,960
Estimated Fair Value | 5,039,760 | 1,514,269
Gross Unrealized Losses | 274,498 | 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 | 311,613 | 181,168
Gross Unrealized Losses - Less than 12 months | 12,155 | 3,170
Estimated Fair Value - 12 months or greater | 42,024 | 39,123
Gross Unrealized Losses - 12 months or greater | 7,957 | 5,501
Estimated Fair Value | 353,637 | 220,291
Gross Unrealized Losses | 20,112 | 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 | 3,158,429 | 786,203
Gross Unrealized Losses - Less than 12 months | 168,659 | 13,276
Estimated Fair Value - 12 months or greater | 130,027 | 108,187
Gross Unrealized Losses - 12 months or greater | 20,031 | 17,386
Estimated Fair Value | 3,288,456 | 894,390
Gross Unrealized Losses | 188,690 | 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 | 140,648 | 12,349
Gross Unrealized Losses - Less than 12 months | 12,530 | 174
Estimated Fair Value - 12 months or greater | 6,898 | 0
Gross Unrealized Losses - 12 months or greater | 1,301 | 0
Estimated Fair Value | 147,546 | 12,349
Gross Unrealized Losses | 13,831 | 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 | 53,633 | 15,199
Gross Unrealized Losses - Less than 12 months | 1,068 | 80
Estimated Fair Value - 12 months or greater | 2,254 | 2,633
Gross Unrealized Losses - 12 months or greater | 457 | 347
Estimated Fair Value | 55,887 | 17,832
Gross Unrealized Losses | 1,525 | 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 | 207,602 | 22,288
Gross Unrealized Losses - Less than 12 months | 11,909 | 97
Estimated Fair Value - 12 months or greater | 18,997 | 19,394
Gross Unrealized Losses - 12 months or greater | 2,257 | 3,199
Estimated Fair Value | 226,599 | 41,682
Gross Unrealized Losses | 14,166 | 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 | 29,043 | 3,421
Gross Unrealized Losses - Less than 12 months | 467 | 26
Estimated Fair Value - 12 months or greater | 30,901 | 31,938
Gross Unrealized Losses - 12 months or greater | 6,841 | 18,815
Estimated Fair Value | 59,944 | 35,359
Gross Unrealized Losses | 7,308 | 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 | 270,863 | 59,119
Gross Unrealized Losses - Less than 12 months | 4,602 | 449
Estimated Fair Value - 12 months or greater | 53,786 | 96,179
Gross Unrealized Losses - 12 months or greater | 5,571 | 9,508
Estimated Fair Value | 324,649 | 155,298
Gross Unrealized Losses | 10,173 | 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 | 971 | 3,317
Gross Unrealized Losses - Less than 12 months | 25 | 764
Estimated Fair Value - 12 months or greater | 10,905 | 68,405
Gross Unrealized Losses - 12 months or greater | 8,008 | 42,307
Estimated Fair Value | 11,876 | 71,722
Gross Unrealized Losses | 8,033 | 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 | 188,153 | 89,507
Gross Unrealized Losses - Less than 12 months | 6,565 | 797
Estimated Fair Value - 12 months or greater | 22,435 | 29,181
Gross Unrealized Losses - 12 months or greater | 5,968 | 7,974
Estimated Fair Value | 210,588 | 118,688
Gross Unrealized Losses | 12,533 | 8,771
US Government Agencies Debt Securities [Member] | 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 | 72,032 | 7,272
Gross Unrealized Losses - Less than 12 months | 2,658 | 24
Estimated Fair Value - 12 months or greater | 3,958 | 0
Gross Unrealized Losses - 12 months or greater | 161 | 0
Estimated Fair Value | 75,990 | 7,272
Gross Unrealized Losses | 2,819 | 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 | 95,935 | 20,602
Gross Unrealized Losses - Less than 12 months | 8,776 | 1,514
Estimated Fair Value - 12 months or greater | 14,981 | 11,736
Gross Unrealized Losses - 12 months or greater | 4,878 | 4,132
Estimated Fair Value | 110,916 | 32,338
Gross Unrealized Losses | 13,654 | 5,646
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 | 644,427 | 244,817
Gross Unrealized Losses - Less than 12 months | 17,479 | 1,953
Estimated Fair Value - 12 months or greater | 10,589 | 7,435
Gross Unrealized Losses - 12 months or greater | 1,153 | 761
Estimated Fair Value | 655,016 | 252,252
Gross Unrealized Losses | 18,632 | 2,714
Nonredeemable Preferred Stock [Member] | Equity securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 42,338 | 5,577
Gross Unrealized Losses - Less than 12 months | 3,331 | 52
Estimated Fair Value - 12 months or greater | 1 | 5,679
Gross Unrealized Losses - 12 months or greater | 2 | 118
Estimated Fair Value | 42,339 | 11,256
Gross Unrealized Losses | 3,333 | 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 | 47,151 | 85,374
Gross Unrealized Losses - Less than 12 months | 2,619 | 1,134
Estimated Fair Value - 12 months or greater | 17,028 | 0
Gross Unrealized Losses - 12 months or greater | 1,433 | 0
Estimated Fair Value | 64,179 | 85,374
Gross Unrealized Losses | $ 4,052 | $ 1,134

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