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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Thousands | Mar. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 1,984,310 | $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months | 418,313 | 448,829
Fixed maturity securities, Fair Value, Total | 2,402,623 | 1,359,238
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 40,732 | 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 23,018 | 14,044
Fixed maturity securities, Gross Unrealized Losses, Total | $ 63,750 | $ 22,787
Number of positions with a gross unrealized loss, 12 Months or Less | security | 837 | 354
Number of position with a gross unrealized loss, more than 12 months | security | 153 | 158
Number of position with a gross unrealized loss, Total | security | 990 | 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 25.60% | 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 5.40% | 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 31.00% | 17.30%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 301,927 | $ 134,032
Fixed maturity securities, Fair Value, More than 12 Months | 39,339 | 40,606
Fixed maturity securities, Fair Value, Total | 341,266 | 174,638
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 8,346 | 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3,255 | 1,979
Fixed maturity securities, Gross Unrealized Losses, Total | 11,601 | 3,032
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 393,555 | 168,634
Fixed maturity securities, Fair Value, More than 12 Months | 118,166 | 122,753
Fixed maturity securities, Fair Value, Total | 511,721 | 291,387
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 9,415 | 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,805 | 3,667
Fixed maturity securities, Gross Unrealized Losses, Total | 17,220 | 5,516
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 224,400 | 29,437
Fixed maturity securities, Fair Value, More than 12 Months | 76,577 | 79,140
Fixed maturity securities, Fair Value, Total | 300,977 | 108,577
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 4,614 | 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 4,902 | 2,335
Fixed maturity securities, Gross Unrealized Losses, Total | 9,516 | 2,435
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 6,390 | 0
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 6,390 | 0
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 136 | 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 136 | 0
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 450,467 | 115,113
Fixed maturity securities, Fair Value, More than 12 Months | 37,572 | 36,081
Fixed maturity securities, Fair Value, Total | 488,039 | 151,194
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 11,923 | 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 2,652 | 1,633
Fixed maturity securities, Gross Unrealized Losses, Total | 14,575 | 4,334
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 607,571 | 457,166
Fixed maturity securities, Fair Value, More than 12 Months | 146,659 | 168,972
Fixed maturity securities, Fair Value, Total | 754,230 | 626,138
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 6,298 | 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 4,404 | 4,400
Fixed maturity securities, Gross Unrealized Losses, Total | $ 10,702 | 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 |  |
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 |  |
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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