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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