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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 | Jun. 30, 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 | $ 2,286,525 | $ 12,073,860
Gross Unrealized Losses - Less than 12 months | 39,708 | 408,581
Estimated Fair Value - 12 months or greater | 2,330,244 | 7,226,996
Gross Unrealized Losses - 12 months or greater | 56,673 | 339,909
Estimated Fair Value | 4,616,769 | 19,300,856
Gross Unrealized Losses | 96,381 | 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 | 222,948 | 884,847
Gross Unrealized Losses - Less than 12 months | 22,225 | 48,368
Estimated Fair Value - 12 months or greater | 158,958 | 133,897
Gross Unrealized Losses - 12 months or greater | 12,560 | 15,297
Estimated Fair Value | 381,906 | 1,018,744
Gross Unrealized Losses | 34,785 | 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 | 2,063,577 | 11,189,013
Gross Unrealized Losses - Less than 12 months | 17,483 | 360,213
Estimated Fair Value - 12 months or greater | 2,171,286 | 7,093,099
Gross Unrealized Losses - 12 months or greater | 44,113 | 324,612
Estimated Fair Value | 4,234,863 | 18,282,112
Gross Unrealized Losses | 61,596 | 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 | 216,611 | 755,679
Gross Unrealized Losses - Less than 12 months | 22,148 | 42,760
Estimated Fair Value - 12 months or greater | 139,318 | 122,559
Gross Unrealized Losses - 12 months or greater | 10,959 | 14,646
Estimated Fair Value | 355,929 | 878,238
Gross Unrealized Losses | 33,107 | 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 | 780,802 | 8,505,371
Gross Unrealized Losses - Less than 12 months | 8,757 | 302,604
Estimated Fair Value - 12 months or greater | 1,276,130 | 3,611,266
Gross Unrealized Losses - 12 months or greater | 28,924 | 195,082
Estimated Fair Value | 2,056,932 | 12,116,637
Gross Unrealized Losses | 37,681 | 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 |  | 443
Gross Unrealized Losses - Less than 12 months |  | 34
Estimated Fair Value - 12 months or greater |  | 1,770
Gross Unrealized Losses - 12 months or greater |  | 243
Estimated Fair Value |  | 2,213
Gross Unrealized Losses |  | 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 | 2,535 | 25,169
Gross Unrealized Losses - Less than 12 months | 2 | 419
Estimated Fair Value - 12 months or greater | 17,555 | 131,806
Gross Unrealized Losses - 12 months or greater | 131 | 1,612
Estimated Fair Value | 20,090 | 156,975
Gross Unrealized Losses | 133 | 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
Gross Unrealized Losses - Less than 12 months | 0 | 0
Estimated Fair Value - 12 months or greater | 976 | 1,026
Gross Unrealized Losses - 12 months or greater | 11 | 34
Estimated Fair Value | 976 | 1,026
Gross Unrealized Losses | 11 | 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 | 57,572 | 269,558
Gross Unrealized Losses - Less than 12 months | 489 | 2,488
Estimated Fair Value - 12 months or greater | 240,046 | 836,741
Gross Unrealized Losses - 12 months or greater | 2,577 | 22,760
Estimated Fair Value | 297,618 | 1,106,299
Gross Unrealized Losses | 3,066 | 25,248
Asset-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
Gross Unrealized Losses - Less than 12 months |  | 0
Estimated Fair Value - 12 months or greater |  | 1,063
Gross Unrealized Losses - 12 months or greater |  | 35
Estimated Fair Value |  | 1,063
Gross Unrealized Losses |  | 35
Asset-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 | 753,026 | 1,102,677
Gross Unrealized Losses - Less than 12 months | 5,383 | 24,271
Estimated Fair Value - 12 months or greater | 399,818 | 381,609
Gross Unrealized Losses - 12 months or greater | 7,679 | 8,523
Estimated Fair Value | 1,152,844 | 1,484,286
Gross Unrealized Losses | 13,062 | 32,794
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 | 79,372 | 384,259
Gross Unrealized Losses - Less than 12 months | 240 | 4,304
Estimated Fair Value - 12 months or greater | 37,442 | 414,719
Gross Unrealized Losses - 12 months or greater | 274 | 13,930
Estimated Fair Value | 116,814 | 798,978
Gross Unrealized Losses | 514 | 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 | 257,328 | 8,616
Gross Unrealized Losses - Less than 12 months | 36 | 80
Estimated Fair Value - 12 months or greater | 76,098 | 1,086,694
Gross Unrealized Losses - 12 months or greater | 334 | 57,787
Estimated Fair Value | 333,426 | 1,095,310
Gross Unrealized Losses | 370 | 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 | 42,876 | 103,504
Gross Unrealized Losses - Less than 12 months | 11 | 1,538
Estimated Fair Value - 12 months or greater | 13,856 | 157,330
Gross Unrealized Losses - 12 months or greater | 1,497 | 7,472
Estimated Fair Value | 56,732 | 260,834
Gross Unrealized Losses | 1,508 | 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 | 6,337 | 128,725
Gross Unrealized Losses - Less than 12 months | 77 | 5,574
Estimated Fair Value - 12 months or greater | 18,664 | 7,479
Gross Unrealized Losses - 12 months or greater | 1,590 | 339
Estimated Fair Value | 25,001 | 136,204
Gross Unrealized Losses | 1,667 | 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 | 90,066 | 789,859
Gross Unrealized Losses - Less than 12 months | 2,565 | 24,509
Estimated Fair Value - 12 months or greater | 110,341 | 472,934
Gross Unrealized Losses - 12 months or greater | 2,697 | 17,446
Estimated Fair Value | 200,407 | 1,262,793
Gross Unrealized Losses | $ 5,262 | $ 41,955

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