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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months |  | 448,829
Fixed maturity securities, Fair Value, Total |  | 1,359,238
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 14,044
Fixed maturity securities, Gross Unrealized Losses, Total |  | $ 22,787
Number of positions with a gross unrealized loss position, 12 Months or Less | security | 1,052 | 354
Number of position with a gross unrealized loss position, more than 12 months | security | 359 | 158
Number of position with a gross unrealized loss position, Total | security | 1,411 | 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 32.70% | 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 11.70% | 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 44.40% | 17.30%
Total |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 2,497,440 | $ 904,382
Fixed maturity securities, Fair Value, More than 12 Months | 889,418 | 447,552
Fixed maturity securities, Fair Value, Total | 3,386,858 | 1,351,934
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 63,640 | 8,494
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 44,038 | 14,014
Fixed maturity securities, Gross Unrealized Losses, Total | 107,678 | 22,508
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 193,447 | 134,032
Fixed maturity securities, Fair Value, More than 12 Months | 157,295 | 40,606
Fixed maturity securities, Fair Value, Total | 350,742 | 174,638
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 5,026 | 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 8,295 | 1,979
Fixed maturity securities, Gross Unrealized Losses, Total | 13,321 | 3,032
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 263,497 | 168,634
Fixed maturity securities, Fair Value, More than 12 Months | 246,213 | 122,753
Fixed maturity securities, Fair Value, Total | 509,710 | 291,387
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 6,746 | 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 10,935 | 3,667
Fixed maturity securities, Gross Unrealized Losses, Total | 17,681 | 5,516
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 291,869 | 29,437
Fixed maturity securities, Fair Value, More than 12 Months | 95,297 | 79,140
Fixed maturity securities, Fair Value, Total | 387,166 | 108,577
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 7,603 | 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 5,891 | 2,335
Fixed maturity securities, Gross Unrealized Losses, Total | 13,494 | 2,435
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 16,250 | 0
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 16,250 | 0
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 760 | 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 760 | 0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 818,519 | 115,113
Fixed maturity securities, Fair Value, More than 12 Months | 99,171 | 36,081
Fixed maturity securities, Fair Value, Total | 917,690 | 151,194
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 27,429 | 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 11,462 | 1,633
Fixed maturity securities, Gross Unrealized Losses, Total | 38,891 | 4,334
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 913,858 | 457,166
Fixed maturity securities, Fair Value, More than 12 Months | 291,442 | 168,972
Fixed maturity securities, Fair Value, Total | 1,205,300 | 626,138
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 16,076 | 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,455 | 4,400
Fixed maturity securities, Gross Unrealized Losses, Total | $ 23,531 | 7,191
Equity securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 6,027
Fixed maturity securities, Fair Value, More than 12 Months |  | 1,277
Fixed maturity securities, Fair Value, Total |  | 7,304
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 249
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 30
Fixed maturity securities, Gross Unrealized Losses, Total |  | $ 279

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