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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Thousands | Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 2,780,337 | $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months | 431,209 | 448,829
Fixed maturity securities, Fair Value, Total | 3,211,546 | 1,359,238
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 68,233 | 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 26,185 | 14,044
Fixed maturity securities, Gross Unrealized Losses, Total | $ 94,418 | $ 22,787
Number of positions with a gross unrealized loss, 12 Months or Less | security | 1,091 | 354
Number of position with a gross unrealized loss, more than 12 months | security | 160 | 158
Number of position with a gross unrealized loss, Total | security | 1,251 | 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 36.60% | 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 5.70% | 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 42.30% | 17.30%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 354,474 | $ 134,032
Fixed maturity securities, Fair Value, More than 12 Months | 40,302 | 40,606
Fixed maturity securities, Fair Value, Total | 394,776 | 174,638
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 12,787 | 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3,805 | 1,979
Fixed maturity securities, Gross Unrealized Losses, Total | 16,592 | 3,032
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 413,744 | 168,634
Fixed maturity securities, Fair Value, More than 12 Months | 120,081 | 122,753
Fixed maturity securities, Fair Value, Total | 533,825 | 291,387
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 14,379 | 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 9,529 | 3,667
Fixed maturity securities, Gross Unrealized Losses, Total | 23,908 | 5,516
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 269,872 | 29,437
Fixed maturity securities, Fair Value, More than 12 Months | 75,715 | 79,140
Fixed maturity securities, Fair Value, Total | 345,587 | 108,577
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 6,713 | 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 4,406 | 2,335
Fixed maturity securities, Gross Unrealized Losses, Total | 11,119 | 2,435
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 19,912 | 0
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 19,912 | 0
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 584 | 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 584 | 0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 833,370 | 115,113
Fixed maturity securities, Fair Value, More than 12 Months | 36,587 | 36,081
Fixed maturity securities, Fair Value, Total | 869,957 | 151,194
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 23,370 | 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3,550 | 1,633
Fixed maturity securities, Gross Unrealized Losses, Total | 26,920 | 4,334
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 888,965 | 457,166
Fixed maturity securities, Fair Value, More than 12 Months | 158,524 | 168,972
Fixed maturity securities, Fair Value, Total | 1,047,489 | 626,138
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 10,400 | 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 4,895 | 4,400
Fixed maturity securities, Gross Unrealized Losses, Total | $ 15,295 | 7,191
Total Fixed Maturity Securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less |  | 904,382
Fixed maturity securities, Fair Value, More than 12 Months |  | 447,552
Fixed maturity securities, Fair Value, Total |  | 1,351,934
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less |  | 8,494
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months |  | 14,014
Fixed maturity securities, Gross Unrealized Losses, Total |  | 22,508
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, 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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