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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 478,866 | $ 2,497,440
Fixed maturity securities, Fair Value, More than 12 Months | 472,720 | 889,418
Fixed maturity securities, Fair Value, Total | 951,586 | 3,386,858
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 5,734 | 63,640
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,880 | 44,038
Fixed maturity securities, Gross Unrealized Losses, Total | $ 13,614 | $ 107,678
Number of positions with a gross unrealized loss, 12 Months or Less | security | 330 | 1,052
Number of position with a gross unrealized loss, more than 12 months | security | 137 | 359
Number of position with a gross unrealized loss, Total | security | 467 | 1,411
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 8.30% | 32.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 8.20% | 11.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 16.50% | 44.40%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 72,422 | $ 193,447
Fixed maturity securities, Fair Value, More than 12 Months | 2,620 | 157,295
Fixed maturity securities, Fair Value, Total | 75,042 | 350,742
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1,282 | 5,026
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 205 | 8,295
Fixed maturity securities, Gross Unrealized Losses, Total | 1,487 | 13,321
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 38,341 | 263,497
Fixed maturity securities, Fair Value, More than 12 Months | 1,527 | 246,213
Fixed maturity securities, Fair Value, Total | 39,868 | 509,710
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 619 | 6,746
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 2 | 10,935
Fixed maturity securities, Gross Unrealized Losses, Total | 621 | 17,681
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 91,195 | 291,869
Fixed maturity securities, Fair Value, More than 12 Months | 9,160 | 95,297
Fixed maturity securities, Fair Value, Total | 100,355 | 387,166
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 977 | 7,603
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 603 | 5,891
Fixed maturity securities, Gross Unrealized Losses, Total | 1,580 | 13,494
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0 | 16,250
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 0 | 16,250
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0 | 760
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 0 | 760
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 58,198 | 818,519
Fixed maturity securities, Fair Value, More than 12 Months | 16,622 | 99,171
Fixed maturity securities, Fair Value, Total | 74,820 | 917,690
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 886 | 27,429
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 909 | 11,462
Fixed maturity securities, Gross Unrealized Losses, Total | 1,795 | 38,891
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 218,710 | 913,858
Fixed maturity securities, Fair Value, More than 12 Months | 442,791 | 291,442
Fixed maturity securities, Fair Value, Total | 661,501 | 1,205,300
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1,970 | 16,076
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 6,161 | 7,455
Fixed maturity securities, Gross Unrealized Losses, Total | $ 8,131 | $ 23,531

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