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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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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 | $ 5,317,458 | $ 8,327,843
Gross Unrealized Losses - Less than 12 months | 64,798 | 253,005
Estimated Fair Value - 12 months or greater | 1,949,631 | 1,210,148
Gross Unrealized Losses - 12 months or greater | 94,006 | 108,194
Estimated Fair Value | 7,267,089 | 9,537,991
Gross Unrealized Losses | 158,804 | 361,199
Equity securities |  |
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Estimated Fair Value - Less than 12 months | 13,158 | 212,899
Gross Unrealized Losses - Less than 12 months | 741 | 7,851
Estimated Fair Value - 12 months or greater | 84,189 | 28,630
Gross Unrealized Losses - 12 months or greater | 3,665 | 5,807
Estimated Fair Value | 97,347 | 241,529
Gross Unrealized Losses | 4,406 | 13,658
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 | 182,161 | 374,831
Gross Unrealized Losses - Less than 12 months | 3,945 | 10,607
Estimated Fair Value - 12 months or greater | 116,460 | 215,908
Gross Unrealized Losses - 12 months or greater | 24,542 | 45,409
Estimated Fair Value | 298,621 | 590,739
Gross Unrealized Losses | 28,487 | 56,016
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 | 5,135,297 | 7,953,012
Gross Unrealized Losses - Less than 12 months | 60,853 | 242,398
Estimated Fair Value - 12 months or greater | 1,833,171 | 994,240
Gross Unrealized Losses - 12 months or greater | 69,464 | 62,785
Estimated Fair Value | 6,968,468 | 8,947,252
Gross Unrealized Losses | 130,317 | 305,183
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 | 170,023 | 330,757
Gross Unrealized Losses - Less than 12 months | 3,780 | 7,914
Estimated Fair Value - 12 months or greater | 95,089 | 163,152
Gross Unrealized Losses - 12 months or greater | 23,785 | 41,605
Estimated Fair Value | 265,112 | 493,909
Gross Unrealized Losses | 27,565 | 49,519
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 | 2,035,856 | 4,661,706
Gross Unrealized Losses - Less than 12 months | 15,923 | 124,444
Estimated Fair Value - 12 months or greater | 1,213,026 | 549,273
Gross Unrealized Losses - 12 months or greater | 49,422 | 43,282
Estimated Fair Value | 3,248,882 | 5,210,979
Gross Unrealized Losses | 65,345 | 167,726
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 | 97,100 | 101,578
Gross Unrealized Losses - Less than 12 months | 1,320 | 3,541
Estimated Fair Value - 12 months or greater | 46,663 | 0
Gross Unrealized Losses - 12 months or greater | 1,112 | 0
Estimated Fair Value | 143,763 | 101,578
Gross Unrealized Losses | 2,432 | 3,541
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 | 93 | 412
Gross Unrealized Losses - 12 months or greater | 3 | 12
Estimated Fair Value | 93 | 412
Gross Unrealized Losses | 3 | 12
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 | 507,372 | 490,473
Gross Unrealized Losses - Less than 12 months | 5,084 | 9,733
Estimated Fair Value - 12 months or greater | 154,469 | 112,216
Gross Unrealized Losses - 12 months or greater | 3,189 | 3,635
Estimated Fair Value | 661,841 | 602,689
Gross Unrealized Losses | 8,273 | 13,368
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 | 5,904
Gross Unrealized Losses - Less than 12 months | 0 | 700
Estimated Fair Value - 12 months or greater | 5,611 | 12,581
Gross Unrealized Losses - 12 months or greater | 532 | 1,465
Estimated Fair Value | 5,611 | 18,485
Gross Unrealized Losses | 532 | 2,165
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 | 516,613 | 563,259
Gross Unrealized Losses - Less than 12 months | 2,318 | 12,010
Estimated Fair Value - 12 months or greater | 133,848 | 257,166
Gross Unrealized Losses - 12 months or greater | 2,213 | 9,653
Estimated Fair Value | 650,461 | 820,425
Gross Unrealized Losses | 4,531 | 21,663
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 |  | 5,815
Gross Unrealized Losses - Less than 12 months |  | 735
Estimated Fair Value - 12 months or greater |  | 0
Gross Unrealized Losses - 12 months or greater |  | 0
Estimated Fair Value |  | 5,815
Gross Unrealized Losses |  | 735
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 | 293,834 | 368,465
Gross Unrealized Losses - Less than 12 months | 3,224 | 6,858
Estimated Fair Value - 12 months or greater | 61,707 | 10,853
Gross Unrealized Losses - 12 months or greater | 2,221 | 166
Estimated Fair Value | 355,541 | 379,318
Gross Unrealized Losses | 5,445 | 7,024
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 | 1,302,732 | 1,056,101
Gross Unrealized Losses - Less than 12 months | 29,712 | 63,044
Estimated Fair Value - 12 months or greater | 56,595 | 0
Gross Unrealized Losses - 12 months or greater | 1,286 | 0
Estimated Fair Value | 1,359,327 | 1,056,101
Gross Unrealized Losses | 30,998 | 63,044
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 | 919 |
Gross Unrealized Losses - Less than 12 months | 88 |
Estimated Fair Value - 12 months or greater | 0 |
Gross Unrealized Losses - 12 months or greater | 0 |
Estimated Fair Value | 919 |
Gross Unrealized Losses | 88 |
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 | 53,977 | 187,194
Gross Unrealized Losses - Less than 12 months | 743 | 9,396
Estimated Fair Value - 12 months or greater | 62,530 | 13,635
Gross Unrealized Losses - 12 months or greater | 5,156 | 3,068
Estimated Fair Value | 116,507 | 200,829
Gross Unrealized Losses | 5,899 | 12,464
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 | 11,219 | 32,355
Gross Unrealized Losses - Less than 12 months | 77 | 1,258
Estimated Fair Value - 12 months or greater | 15,667 | 39,763
Gross Unrealized Losses - 12 months or greater | 222 | 2,327
Estimated Fair Value | 26,886 | 72,118
Gross Unrealized Losses | 299 | 3,585
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 | 327,813 | 524,236
Gross Unrealized Losses - Less than 12 months | 2,529 | 13,372
Estimated Fair Value - 12 months or greater | 104,333 | 51,097
Gross Unrealized Losses - 12 months or greater | 4,865 | 2,981
Estimated Fair Value | 432,146 | 575,333
Gross Unrealized Losses | 7,394 | 16,353
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 | 6,712 | 10,831
Gross Unrealized Losses - Less than 12 months | 345 | 831
Estimated Fair Value - 12 months or greater | 25,983 | 21,879
Gross Unrealized Losses - 12 months or greater | 2,944 | 5,506
Estimated Fair Value | 32,695 | 32,710
Gross Unrealized Losses | 3,289 | 6,337
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 | 6,446 | 202,068
Gross Unrealized Losses - Less than 12 months | 396 | 7,020
Estimated Fair Value - 12 months or greater | 58,206 | 6,751
Gross Unrealized Losses - 12 months or greater | 721 | 301
Estimated Fair Value | 64,652 | 208,819
Gross Unrealized Losses | $ 1,117 | $ 7,321

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