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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed maturity securities - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | $ 2,439,315 | $ 12,073,860
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 56,533 | 408,581
Estimated Fair Value - 12 months or greater | 7,032,814 | 7,226,996
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 173,690 | 339,909
Estimated Fair Value | 9,472,129 | 19,300,856
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 230,223 | 748,490
Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 242,781 | 884,847
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22,236 | 48,368
Estimated Fair Value - 12 months or greater | 191,246 | 133,897
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,351 | 15,297
Estimated Fair Value | 434,027 | 1,018,744
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 34,587 | 63,665
Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 2,196,534 | 11,189,013
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 34,297 | 360,213
Estimated Fair Value - 12 months or greater | 6,841,568 | 7,093,099
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 161,339 | 324,612
Estimated Fair Value | 9,038,102 | 18,282,112
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 195,636 | 684,825
Corporate Debt Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 215,368 | 755,679
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 21,398 | 42,760
Estimated Fair Value - 12 months or greater | 161,915 | 122,559
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10,685 | 14,646
Estimated Fair Value | 377,283 | 878,238
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 32,083 | 57,406
Corporate Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,140,753 | 8,505,371
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23,578 | 302,604
Estimated Fair Value - 12 months or greater | 3,756,371 | 3,611,266
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 108,434 | 195,082
Estimated Fair Value | 4,897,124 | 12,116,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 132,012 | 497,686
Canadian and Canadian provincial governments | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 0 | 443
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 34
Estimated Fair Value - 12 months or greater | 1,001 | 1,770
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23 | 243
Estimated Fair Value | 1,001 | 2,213
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 23 | 277
Canadian and Canadian provincial governments | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 2,812 | 25,169
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 419
Estimated Fair Value - 12 months or greater | 72,244 | 131,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 636 | 1,612
Estimated Fair Value | 75,056 | 156,975
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 655 | 2,031
Residential mortgage-backed securities | Non-investment grade 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
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Estimated Fair Value - 12 months or greater | 1,029 | 1,026
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 31 | 34
Estimated Fair Value | 1,029 | 1,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 31 | 34
Residential mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 29,505 | 269,558
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 122 | 2,488
Estimated Fair Value - 12 months or greater | 672,715 | 836,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10,109 | 22,760
Estimated Fair Value | 702,220 | 1,106,299
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 10,231 | 25,248
Asset-backed Securities [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
Estimated Fair Value - 12 months or greater |  | 1,063
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 35
Estimated Fair Value |  | 1,063
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 35
Asset-backed Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 774,538 | 1,102,677
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7,246 | 24,271
Estimated Fair Value - 12 months or greater | 528,169 | 381,609
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8,472 | 8,523
Estimated Fair Value | 1,302,707 | 1,484,286
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 15,718 | 32,794
Commercial mortgage-backed securities | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 27,413 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 838 |
Estimated Fair Value - 12 months or greater | 27,301 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,612 |
Estimated Fair Value | 54,714 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,450 |
Commercial mortgage-backed securities | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 100,664 | 384,259
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 369 | 4,304
Estimated Fair Value - 12 months or greater | 227,404 | 414,719
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,746 | 13,930
Estimated Fair Value | 328,068 | 798,978
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 3,115 | 18,234
US Government Agencies Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 1,265 | 8,616
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 80
Estimated Fair Value - 12 months or greater | 1,125,274 | 1,086,694
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 21,237 | 57,787
Estimated Fair Value | 1,126,539 | 1,095,310
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 21,238 | 57,867
US States and Political Subdivisions Debt Securities [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 31,416 | 103,504
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 149 | 1,538
Estimated Fair Value - 12 months or greater | 113,463 | 157,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,492 | 7,472
Estimated Fair Value | 144,879 | 260,834
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 2,641 | 9,010
Debt Security, Government, Non-US [Member] | Non-investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months |  | 128,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 5,574
Estimated Fair Value - 12 months or greater |  | 7,479
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 339
Estimated Fair Value |  | 136,204
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | 5,913
Debt Security, Government, Non-US [Member] | Investment grade securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 115,581 | 789,859
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,813 | 24,509
Estimated Fair Value - 12 months or greater | 345,928 | 472,934
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,213 | 17,446
Estimated Fair Value | 461,509 | 1,262,793
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 10,026 | $ 41,955

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