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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, 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 | $ 6,362,753 | $ 8,327,843
Gross Unrealized Losses - Less than 12 months | 111,152 | 253,005
Estimated Fair Value - 12 months or greater | 881,805 | 1,210,148
Gross Unrealized Losses - 12 months or greater | 61,291 | 108,194
Estimated Fair Value | 7,244,558 | 9,537,991
Gross Unrealized Losses | 172,443 | 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 | 64,990 | 212,899
Gross Unrealized Losses - Less than 12 months | 3,617 | 7,851
Estimated Fair Value - 12 months or greater | 24,807 | 28,630
Gross Unrealized Losses - 12 months or greater | 3,021 | 5,807
Estimated Fair Value | 89,797 | 241,529
Gross Unrealized Losses | 6,638 | 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 | 295,307 | 374,831
Gross Unrealized Losses - Less than 12 months | 4,837 | 10,607
Estimated Fair Value - 12 months or greater | 118,570 | 215,908
Gross Unrealized Losses - 12 months or greater | 27,347 | 45,409
Estimated Fair Value | 413,877 | 590,739
Gross Unrealized Losses | 32,184 | 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 | 6,067,446 | 7,953,012
Gross Unrealized Losses - Less than 12 months | 106,315 | 242,398
Estimated Fair Value - 12 months or greater | 763,235 | 994,240
Gross Unrealized Losses - 12 months or greater | 33,944 | 62,785
Estimated Fair Value | 6,830,681 | 8,947,252
Gross Unrealized Losses | 140,259 | 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 | 255,991 | 330,757
Gross Unrealized Losses - Less than 12 months | 4,547 | 7,914
Estimated Fair Value - 12 months or greater | 93,562 | 163,152
Gross Unrealized Losses - 12 months or greater | 26,081 | 41,605
Estimated Fair Value | 349,553 | 493,909
Gross Unrealized Losses | 30,628 | 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 | 2,895,605 | 4,661,706
Gross Unrealized Losses - Less than 12 months | 46,389 | 124,444
Estimated Fair Value - 12 months or greater | 399,546 | 549,273
Gross Unrealized Losses - 12 months or greater | 23,252 | 43,282
Estimated Fair Value | 3,295,151 | 5,210,979
Gross Unrealized Losses | 69,641 | 167,726
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 | 1,247 |
Gross Unrealized Losses - Less than 12 months | 3 |
Estimated Fair Value - 12 months or greater | 0 |
Gross Unrealized Losses - 12 months or greater | 0 |
Estimated Fair Value | 1,247 |
Gross Unrealized Losses | 3 |
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 | 116,719 | 101,578
Gross Unrealized Losses - Less than 12 months | 2,457 | 3,541
Estimated Fair Value - 12 months or greater | 0 | 0
Gross Unrealized Losses - 12 months or greater | 0 | 0
Estimated Fair Value | 116,719 | 101,578
Gross Unrealized Losses | 2,457 | 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 | 107 | 412
Gross Unrealized Losses - 12 months or greater | 4 | 12
Estimated Fair Value | 107 | 412
Gross Unrealized Losses | 4 | 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 | 471,933 | 490,473
Gross Unrealized Losses - Less than 12 months | 6,872 | 9,733
Estimated Fair Value - 12 months or greater | 100,785 | 112,216
Gross Unrealized Losses - 12 months or greater | 1,918 | 3,635
Estimated Fair Value | 572,718 | 602,689
Gross Unrealized Losses | 8,790 | 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 | 7,295 | 12,581
Gross Unrealized Losses - 12 months or greater | 557 | 1,465
Estimated Fair Value | 7,295 | 18,485
Gross Unrealized Losses | 557 | 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 | 285,211 | 563,259
Gross Unrealized Losses - Less than 12 months | 1,451 | 12,010
Estimated Fair Value - 12 months or greater | 204,154 | 257,166
Gross Unrealized Losses - 12 months or greater | 3,916 | 9,653
Estimated Fair Value | 489,365 | 820,425
Gross Unrealized Losses | 5,367 | 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 | 352,867 | 368,465
Gross Unrealized Losses - Less than 12 months | 4,897 | 6,858
Estimated Fair Value - 12 months or greater | 2,195 | 10,853
Gross Unrealized Losses - 12 months or greater | 38 | 166
Estimated Fair Value | 355,062 | 379,318
Gross Unrealized Losses | 4,935 | 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 | 1,378,976 | 1,056,101
Gross Unrealized Losses - Less than 12 months | 31,962 | 63,044
Estimated Fair Value - 12 months or greater | 13,763 | 0
Gross Unrealized Losses - 12 months or greater | 86 | 0
Estimated Fair Value | 1,392,739 | 1,056,101
Gross Unrealized Losses | 32,048 | 63,044
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 | 125,465 | 187,194
Gross Unrealized Losses - Less than 12 months | 5,098 | 9,396
Estimated Fair Value - 12 months or greater | 13,558 | 13,635
Gross Unrealized Losses - 12 months or greater | 3,118 | 3,068
Estimated Fair Value | 139,023 | 200,829
Gross Unrealized Losses | 8,216 | 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 | 38,069 | 32,355
Gross Unrealized Losses - Less than 12 months | 287 | 1,258
Estimated Fair Value - 12 months or greater | 17,606 | 39,763
Gross Unrealized Losses - 12 months or greater | 705 | 2,327
Estimated Fair Value | 55,675 | 72,118
Gross Unrealized Losses | 992 | 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 | 440,670 | 524,236
Gross Unrealized Losses - Less than 12 months | 7,189 | 13,372
Estimated Fair Value - 12 months or greater | 29,234 | 51,097
Gross Unrealized Losses - 12 months or greater | 1,616 | 2,981
Estimated Fair Value | 469,904 | 575,333
Gross Unrealized Losses | 8,805 | 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 | 0 | 10,831
Gross Unrealized Losses - Less than 12 months | 0 | 831
Estimated Fair Value - 12 months or greater | 24,807 | 21,879
Gross Unrealized Losses - 12 months or greater | 3,021 | 5,506
Estimated Fair Value | 24,807 | 32,710
Gross Unrealized Losses | 3,021 | 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 | 64,990 | 202,068
Gross Unrealized Losses - Less than 12 months | 3,617 | 7,020
Estimated Fair Value - 12 months or greater | 0 | 6,751
Gross Unrealized Losses - 12 months or greater | 0 | 301
Estimated Fair Value | 64,990 | 208,819
Gross Unrealized Losses | $ 3,617 | $ 7,321

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