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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 | Sep. 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 | $ 3,039,667 | $ 12,073,860
Gross Unrealized Losses - Less than 12 months | 60,114 | 408,581
Estimated Fair Value - 12 months or greater | 1,251,213 | 7,226,996
Gross Unrealized Losses - 12 months or greater | 42,129 | 339,909
Estimated Fair Value | 4,290,880 | 19,300,856
Gross Unrealized Losses | 102,243 | 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 | 220,064 | 884,847
Gross Unrealized Losses - Less than 12 months | 24,862 | 48,368
Estimated Fair Value - 12 months or greater | 136,782 | 133,897
Gross Unrealized Losses - 12 months or greater | 17,305 | 15,297
Estimated Fair Value | 356,846 | 1,018,744
Gross Unrealized Losses | 42,167 | 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 | 2,819,603 | 11,189,013
Gross Unrealized Losses - Less than 12 months | 35,252 | 360,213
Estimated Fair Value - 12 months or greater | 1,114,431 | 7,093,099
Gross Unrealized Losses - 12 months or greater | 24,824 | 324,612
Estimated Fair Value | 3,934,034 | 18,282,112
Gross Unrealized Losses | 60,076 | 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 | 206,108 | 755,679
Gross Unrealized Losses - Less than 12 months | 24,561 | 42,760
Estimated Fair Value - 12 months or greater | 122,670 | 122,559
Gross Unrealized Losses - 12 months or greater | 16,417 | 14,646
Estimated Fair Value | 328,778 | 878,238
Gross Unrealized Losses | 40,978 | 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 | 1,570,113 | 8,505,371
Gross Unrealized Losses - Less than 12 months | 25,598 | 302,604
Estimated Fair Value - 12 months or greater | 410,462 | 3,611,266
Gross Unrealized Losses - 12 months or greater | 11,576 | 195,082
Estimated Fair Value | 1,980,575 | 12,116,637
Gross Unrealized Losses | 37,174 | 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 | 867 | 25,169
Gross Unrealized Losses - Less than 12 months | 10 | 419
Estimated Fair Value - 12 months or greater | 17,509 | 131,806
Gross Unrealized Losses - 12 months or greater | 180 | 1,612
Estimated Fair Value | 18,376 | 156,975
Gross Unrealized Losses | 190 | 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 | 939 | 1,026
Gross Unrealized Losses - 12 months or greater | 11 | 34
Estimated Fair Value | 939 | 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 | 222,644 | 269,558
Gross Unrealized Losses - Less than 12 months | 987 | 2,488
Estimated Fair Value - 12 months or greater | 116,037 | 836,741
Gross Unrealized Losses - 12 months or greater | 1,218 | 22,760
Estimated Fair Value | 338,681 | 1,106,299
Gross Unrealized Losses | 2,205 | 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 | 765,223 | 1,102,677
Gross Unrealized Losses - Less than 12 months | 4,861 | 24,271
Estimated Fair Value - 12 months or greater | 413,297 | 381,609
Gross Unrealized Losses - 12 months or greater | 9,133 | 8,523
Estimated Fair Value | 1,178,520 | 1,484,286
Gross Unrealized Losses | 13,994 | 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 | 1,042 |
Gross Unrealized Losses - Less than 12 months | 11 |
Estimated Fair Value - 12 months or greater | 0 |
Gross Unrealized Losses - 12 months or greater | 0 |
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 | 48,699 | 384,259
Gross Unrealized Losses - Less than 12 months | 218 | 4,304
Estimated Fair Value - 12 months or greater | 32,638 | 414,719
Gross Unrealized Losses - 12 months or greater | 232 | 13,930
Estimated Fair Value | 81,337 | 798,978
Gross Unrealized Losses | 450 | 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 | 2,758 | 8,616
Gross Unrealized Losses - Less than 12 months | 7 | 80
Estimated Fair Value - 12 months or greater | 65,220 | 1,086,694
Gross Unrealized Losses - 12 months or greater | 221 | 57,787
Estimated Fair Value | 67,978 | 1,095,310
Gross Unrealized Losses | 228 | 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 | 11,129 | 103,504
Gross Unrealized Losses - Less than 12 months | 97 | 1,538
Estimated Fair Value - 12 months or greater | 13,838 | 157,330
Gross Unrealized Losses - 12 months or greater | 1,503 | 7,472
Estimated Fair Value | 24,967 | 260,834
Gross Unrealized Losses | 1,600 | 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 | 12,914 | 128,725
Gross Unrealized Losses - Less than 12 months | 290 | 5,574
Estimated Fair Value - 12 months or greater | 13,173 | 7,479
Gross Unrealized Losses - 12 months or greater | 877 | 339
Estimated Fair Value | 26,087 | 136,204
Gross Unrealized Losses | 1,167 | 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 | 198,170 | 789,859
Gross Unrealized Losses - Less than 12 months | 3,474 | 24,509
Estimated Fair Value - 12 months or greater | 45,430 | 472,934
Gross Unrealized Losses - 12 months or greater | 761 | 17,446
Estimated Fair Value | 243,600 | 1,262,793
Gross Unrealized Losses | $ 4,235 | $ 41,955

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