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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | Jun. 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 | $ 14,260,261 | $ 4,565,273
Gross Unrealized Losses - Less than 12 months | 454,493 | 40,239
Estimated Fair Value - 12 months or greater | 2,494,303 | 2,738,393
Gross Unrealized Losses - 12 months or greater | 137,715 | 73,107
Estimated Fair Value | 16,754,564 | 7,303,666
Gross Unrealized Losses | 592,208 | 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 | 883,576 | 225,474
Gross Unrealized Losses - Less than 12 months | 55,107 | 3,450
Estimated Fair Value - 12 months or greater | 66,027 | 93,723
Gross Unrealized Losses - 12 months or greater | 10,277 | 7,559
Estimated Fair Value | 949,603 | 319,197
Gross Unrealized Losses | 65,384 | 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 | 13,376,685 | 4,339,799
Gross Unrealized Losses - Less than 12 months | 399,386 | 36,789
Estimated Fair Value - 12 months or greater | 2,428,276 | 2,644,670
Gross Unrealized Losses - 12 months or greater | 127,438 | 65,548
Estimated Fair Value | 15,804,961 | 6,984,469
Gross Unrealized Losses | 526,824 | 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 | 735,338 | 194,879
Gross Unrealized Losses - Less than 12 months | 47,846 | 3,317
Estimated Fair Value - 12 months or greater | 56,042 | 75,731
Gross Unrealized Losses - 12 months or greater | 9,851 | 6,933
Estimated Fair Value | 791,380 | 270,610
Gross Unrealized Losses | 57,697 | 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 | 9,135,620 | 1,886,212
Gross Unrealized Losses - Less than 12 months | 299,909 | 17,099
Estimated Fair Value - 12 months or greater | 818,555 | 1,009,750
Gross Unrealized Losses - 12 months or greater | 51,938 | 28,080
Estimated Fair Value | 9,954,175 | 2,895,962
Gross Unrealized Losses | 351,847 | 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 | 1,864 | 1,995
Gross Unrealized Losses - Less than 12 months | 150 | 20
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 1,864 | 1,995
Gross Unrealized Losses | 150 | 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 | 46,392 | 18,688
Gross Unrealized Losses - Less than 12 months | 668 | 91
Estimated Fair Value - 12 months or greater | 110,326 | 111,560
Gross Unrealized Losses - 12 months or greater | 3,058 | 1,596
Estimated Fair Value | 156,718 | 130,248
Gross Unrealized Losses | 3,726 | 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 | 1,194 | 1,369
Gross Unrealized Losses - 12 months or greater | 24 | 22
Estimated Fair Value | 1,194 | 1,369
Gross Unrealized Losses | 24 | 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 | 1,101,941 | 566,699
Gross Unrealized Losses - Less than 12 months | 25,546 | 5,852
Estimated Fair Value - 12 months or greater | 241,914 | 224,439
Gross Unrealized Losses - 12 months or greater | 9,032 | 6,004
Estimated Fair Value | 1,343,855 | 791,138
Gross Unrealized Losses | 34,578 | 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 | 1,148 | 1,489
Gross Unrealized Losses - 12 months or greater | 47 | 53
Estimated Fair Value | 1,148 | 1,489
Gross Unrealized Losses | 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 | 807,714 | 434,274
Gross Unrealized Losses - Less than 12 months | 10,637 | 2,707
Estimated Fair Value - 12 months or greater | 139,676 | 168,524
Gross Unrealized Losses - 12 months or greater | 3,187 | 2,434
Estimated Fair Value | 947,390 | 602,798
Gross Unrealized Losses | 13,824 | 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 | 612,214 | 220,401
Gross Unrealized Losses - Less than 12 months | 11,097 | 1,914
Estimated Fair Value - 12 months or greater | 104,426 | 103,269
Gross Unrealized Losses - 12 months or greater | 4,601 | 2,920
Estimated Fair Value | 716,640 | 323,670
Gross Unrealized Losses | 15,698 | 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 | 584,758 | 800,298
Gross Unrealized Losses - Less than 12 months | 20,707 | 6,177
Estimated Fair Value - 12 months or greater | 747,679 | 767,197
Gross Unrealized Losses - 12 months or greater | 45,958 | 15,756
Estimated Fair Value | 1,332,437 | 1,567,495
Gross Unrealized Losses | 66,665 | 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 | 168,817 | 43,510
Gross Unrealized Losses - Less than 12 months | 5,064 | 242
Estimated Fair Value - 12 months or greater | 66,122 | 68,666
Gross Unrealized Losses - 12 months or greater | 4,257 | 4,054
Estimated Fair Value | 234,939 | 112,176
Gross Unrealized Losses | 9,321 | 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 | 146,374 | 28,600
Gross Unrealized Losses - Less than 12 months | 7,111 | 113
Estimated Fair Value - 12 months or greater | 7,643 | 15,134
Gross Unrealized Losses - 12 months or greater | 355 | 551
Estimated Fair Value | 154,017 | 43,734
Gross Unrealized Losses | 7,466 | 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 | 919,229 | 369,717
Gross Unrealized Losses - Less than 12 months | 25,758 | 2,707
Estimated Fair Value - 12 months or greater | 199,578 | 191,265
Gross Unrealized Losses - 12 months or greater | 5,407 | 4,704
Estimated Fair Value | 1,118,807 | 560,982
Gross Unrealized Losses | $ 31,165 | 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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