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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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 |  | $ 4,565,273
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | 40,239
Estimated Fair Value - 12 months or greater |  | 2,738,393
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 73,107
Estimated Fair Value |  | 7,303,666
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | 1,024
Estimated Fair Value - 12 months or greater |  | 73,722
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 2,623
Estimated Fair Value |  | 79,624
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | 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 |  | 225,474
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | 3,450
Estimated Fair Value - 12 months or greater |  | 93,723
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 7,559
Estimated Fair Value |  | 319,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | 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 | $ 10,738,781 | 4,339,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 226,619 | 36,789
Estimated Fair Value - 12 months or greater | 2,440,830 | 2,644,670
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 115,895 | 65,548
Estimated Fair Value | 13,179,611 | 6,984,469
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 342,514 | 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 | 452,086 | 194,879
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 29,597 | 3,317
Estimated Fair Value - 12 months or greater | 46,976 | 75,731
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 8,337 | 6,933
Estimated Fair Value | 499,062 | 270,610
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 37,934 | 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 | 7,282,079 | 1,886,212
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 155,541 | 17,099
Estimated Fair Value - 12 months or greater | 883,699 | 1,009,750
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 46,908 | 28,080
Estimated Fair Value | 8,165,778 | 2,895,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 202,449 | 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 | 1,900 | 1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 114 | 20
Estimated Fair Value - 12 months or greater | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 0 | 0
Estimated Fair Value | 1,900 | 1,995
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 114 | 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 | 39,192 | 18,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 390 | 91
Estimated Fair Value - 12 months or greater | 109,552 | 111,560
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 2,536 | 1,596
Estimated Fair Value | 148,744 | 130,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 2,926 | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | 0
Estimated Fair Value - 12 months or greater | 1,272 | 1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 25 | 22
Estimated Fair Value | 1,272 | 1,369
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 25 | 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 | 897,255 | 566,699
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 19,899 | 5,852
Estimated Fair Value - 12 months or greater | 225,288 | 224,439
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 7,575 | 6,004
Estimated Fair Value | 1,122,543 | 791,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 27,474 | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | 0
Estimated Fair Value - 12 months or greater | 1,173 | 1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 47 | 53
Estimated Fair Value | 1,173 | 1,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 47 | 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 | 612,053 | 434,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 7,001 | 2,707
Estimated Fair Value - 12 months or greater | 114,605 | 168,524
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 2,423 | 2,434
Estimated Fair Value | 726,658 | 602,798
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 9,424 | 5,141
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 | 57,385 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 662 |
Estimated Fair Value - 12 months or greater | 12,045 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 169 |
Estimated Fair Value | 69,430 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 831 |
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 | 538,464 | 220,401
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 8,026 | 1,914
Estimated Fair Value - 12 months or greater | 103,447 | 103,269
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 4,210 | 2,920
Estimated Fair Value | 641,911 | 323,670
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 12,236 | 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 | 488,095 | 800,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 16,856 | 6,177
Estimated Fair Value - 12 months or greater | 744,844 | 767,197
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 42,558 | 15,756
Estimated Fair Value | 1,232,939 | 1,567,495
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 59,414 | 21,933
US States and Political Subdivisions 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 | 511,371 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 30,373 |
Estimated Fair Value - 12 months or greater | 61,466 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 8,578 |
Estimated Fair Value | 572,837 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 38,951 |
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 | 135,158 | 43,510
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 3,331 | 242
Estimated Fair Value - 12 months or greater | 67,949 | 68,666
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 4,685 | 4,054
Estimated Fair Value | 203,107 | 112,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 8,016 | 4,296
Foreign Government 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 | 11,250,152 | 28,600
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 256,992 | 113
Estimated Fair Value - 12 months or greater | 2,502,296 | 15,134
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 124,473 | 551
Estimated Fair Value | 13,752,448 | 43,734
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 381,465 | 664
Foreign Government 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 | 746,485 | 369,717
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 15,575 | 2,707
Estimated Fair Value - 12 months or greater | 191,446 | 191,265
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 5,000 | 4,704
Estimated Fair Value | 937,931 | 560,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 20,575 | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | 1
Estimated Fair Value - 12 months or greater |  | 26,471
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 2,225
Estimated Fair Value |  | 26,553
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | 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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss |  | 1,023
Estimated Fair Value - 12 months or greater |  | 47,251
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss |  | 398
Estimated Fair Value |  | 53,071
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss |  | $ 1,421

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