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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
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 | $ 14,519,974 | $ 4,565,273
Gross Unrealized Losses - Less than 12 months | 410,779 | 40,239
Estimated Fair Value - 12 months or greater | 3,874,370 | 2,738,393
Gross Unrealized Losses - 12 months or greater | 242,304 | 73,107
Estimated Fair Value | 18,394,344 | 7,303,666
Gross Unrealized Losses | 653,083 | 113,346
Equity securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months |  | 5,902
Gross Unrealized Losses - Less than 12 months |  | 1,024
Estimated Fair Value - 12 months or greater |  | 73,722
Gross Unrealized Losses - 12 months or greater |  | 2,623
Estimated Fair Value |  | 79,624
Gross Unrealized Losses |  | 3,647
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 | 682,541 | 225,474
Gross Unrealized Losses - Less than 12 months | 30,048 | 3,450
Estimated Fair Value - 12 months or greater | 86,297 | 93,723
Gross Unrealized Losses - 12 months or greater | 7,729 | 7,559
Estimated Fair Value | 768,838 | 319,197
Gross Unrealized Losses | 37,777 | 11,009
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 | 13,837,433 | 4,339,799
Gross Unrealized Losses - Less than 12 months | 380,731 | 36,789
Estimated Fair Value - 12 months or greater | 3,788,073 | 2,644,670
Gross Unrealized Losses - 12 months or greater | 234,575 | 65,548
Estimated Fair Value | 17,625,506 | 6,984,469
Gross Unrealized Losses | 615,306 | 102,337
Corporate Debt Securities [Member] | 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 | 539,521 | 194,879
Gross Unrealized Losses - Less than 12 months | 23,955 | 3,317
Estimated Fair Value - 12 months or greater | 77,675 | 75,731
Gross Unrealized Losses - 12 months or greater | 7,296 | 6,933
Estimated Fair Value | 617,196 | 270,610
Gross Unrealized Losses | 31,251 | 10,250
Corporate 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 | 10,117,970 | 1,886,212
Gross Unrealized Losses - Less than 12 months | 303,926 | 17,099
Estimated Fair Value - 12 months or greater | 1,290,804 | 1,009,750
Gross Unrealized Losses - 12 months or greater | 81,236 | 28,080
Estimated Fair Value | 11,408,774 | 2,895,962
Gross Unrealized Losses | 385,162 | 45,179
Canadian and Canadian provincial governments | 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 | 2,328 | 1,995
Gross Unrealized Losses - Less than 12 months | 162 | 20
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 2,328 | 1,995
Gross Unrealized Losses | 162 | 20
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 | 58,816 | 18,688
Gross Unrealized Losses - Less than 12 months | 1,211 | 91
Estimated Fair Value - 12 months or greater | 107,167 | 111,560
Gross Unrealized Losses - 12 months or greater | 2,736 | 1,596
Estimated Fair Value | 165,983 | 130,248
Gross Unrealized Losses | 3,947 | 1,687
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 | 0 | 0
Gross Unrealized Losses - Less than 12 months | 0 | 0
Estimated Fair Value - 12 months or greater | 1,102 | 1,369
Gross Unrealized Losses - 12 months or greater | 20 | 22
Estimated Fair Value | 1,102 | 1,369
Gross Unrealized Losses | 20 | 22
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 | 931,044 | 566,699
Gross Unrealized Losses - Less than 12 months | 23,339 | 5,852
Estimated Fair Value - 12 months or greater | 528,739 | 224,439
Gross Unrealized Losses - 12 months or greater | 27,063 | 6,004
Estimated Fair Value | 1,459,783 | 791,138
Gross Unrealized Losses | 50,402 | 11,856
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 | 0 | 0
Gross Unrealized Losses - Less than 12 months | 0 | 0
Estimated Fair Value - 12 months or greater | 1,110 | 1,489
Gross Unrealized Losses - 12 months or greater | 52 | 53
Estimated Fair Value | 1,110 | 1,489
Gross Unrealized Losses | 52 | 53
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 | 680,900 | 434,274
Gross Unrealized Losses - Less than 12 months | 8,650 | 2,707
Estimated Fair Value - 12 months or greater | 262,544 | 168,524
Gross Unrealized Losses - 12 months or greater | 6,243 | 2,434
Estimated Fair Value | 943,444 | 602,798
Gross Unrealized Losses | 14,893 | 5,141
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 | 555,716 | 220,401
Gross Unrealized Losses - Less than 12 months | 8,304 | 1,914
Estimated Fair Value - 12 months or greater | 207,943 | 103,269
Gross Unrealized Losses - 12 months or greater | 8,580 | 2,920
Estimated Fair Value | 763,659 | 323,670
Gross Unrealized Losses | 16,884 | 4,834
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 | 197,114 | 800,298
Gross Unrealized Losses - Less than 12 months | 3,913 | 6,177
Estimated Fair Value - 12 months or greater | 1,002,661 | 767,197
Gross Unrealized Losses - 12 months or greater | 90,740 | 15,756
Estimated Fair Value | 1,199,775 | 1,567,495
Gross Unrealized Losses | 94,653 | 21,933
US States and Political Subdivisions 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 | 261,456 | 43,510
Gross Unrealized Losses - Less than 12 months | 6,722 | 242
Estimated Fair Value - 12 months or greater | 90,649 | 68,666
Gross Unrealized Losses - 12 months or greater | 6,915 | 4,054
Estimated Fair Value | 352,105 | 112,176
Gross Unrealized Losses | 13,637 | 4,296
Debt Security, Government, Non-US [Member] | 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 | 140,692 | 28,600
Gross Unrealized Losses - Less than 12 months | 5,931 | 113
Estimated Fair Value - 12 months or greater | 6,410 | 15,134
Gross Unrealized Losses - 12 months or greater | 361 | 551
Estimated Fair Value | 147,102 | 43,734
Gross Unrealized Losses | 6,292 | 664
Debt Security, Government, Non-US [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 | 1,034,417 | 369,717
Gross Unrealized Losses - Less than 12 months | 24,666 | 2,707
Estimated Fair Value - 12 months or greater | 297,566 | 191,265
Gross Unrealized Losses - 12 months or greater | 11,062 | 4,704
Estimated Fair Value | 1,331,983 | 560,982
Gross Unrealized Losses | $ 35,728 | 7,411
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 |  | 82
Gross Unrealized Losses - Less than 12 months |  | 1
Estimated Fair Value - 12 months or greater |  | 26,471
Gross Unrealized Losses - 12 months or greater |  | 2,225
Estimated Fair Value |  | 26,553
Gross Unrealized Losses |  | 2,226
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 |  | 5,820
Gross Unrealized Losses - Less than 12 months |  | 1,023
Estimated Fair Value - 12 months or greater |  | 47,251
Gross Unrealized Losses - 12 months or greater |  | 398
Estimated Fair Value |  | 53,071
Gross Unrealized Losses |  | $ 1,421

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