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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Thousands | Jun. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 1,121,359 | $ 1,994,925
Fixed maturity securities, Fair Value, More than 12 Months | 179,172 | 307,486
Fixed maturity securities, Fair Value, Total | 1,300,531 | 2,302,411
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 23,571 | 61,692
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,870 | 14,292
Fixed maturity securities, Gross Unrealized Losses, Total | $ 31,441 | $ 75,984
Number of positions with a gross unrealized loss, 12 Months or Less | security | 413 | 629
Number of position with a gross unrealized loss, more than 12 months | security | 60 | 102
Number of position with a gross unrealized loss, Total | security | 473 | 731
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 14.50% | 26.30%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 2.30% | 4.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 16.80% | 30.30%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 101,350 | $ 186,439
Fixed maturity securities, Fair Value, More than 12 Months | 3,480 | 3,235
Fixed maturity securities, Fair Value, Total | 104,830 | 189,674
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,320 | 6,176
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 313 | 544
Fixed maturity securities, Gross Unrealized Losses, Total | 2,633 | 6,720
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 223,396 | 219,372
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 223,396 | 219,372
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 5,913 | 10,120
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 5,913 | 10,120
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 179,314 | 408,163
Fixed maturity securities, Fair Value, More than 12 Months | 10,023 | 9,928
Fixed maturity securities, Fair Value, Total | 189,337 | 418,091
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 6,893 | 19,006
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3,536 | 3,582
Fixed maturity securities, Gross Unrealized Losses, Total | 10,429 | 22,588
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 1,980 | 24,182
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 1,980 | 24,182
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 5 | 297
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 5 | 297
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 157,230 | 459,402
Fixed maturity securities, Fair Value, More than 12 Months | 26,907 | 57,261
Fixed maturity securities, Fair Value, Total | 184,137 | 516,663
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,949 | 11,056
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,312 | 3,770
Fixed maturity securities, Gross Unrealized Losses, Total | 4,261 | 14,826
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 449,341 | 640,691
Fixed maturity securities, Fair Value, More than 12 Months | 133,899 | 229,106
Fixed maturity securities, Fair Value, Total | 583,240 | 869,797
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 4,764 | 10,470
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,881 | 5,389
Fixed maturity securities, Gross Unrealized Losses, Total | 6,645 | 15,859
Total Fixed Maturity Securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 1,112,611 | 1,938,249
Fixed maturity securities, Fair Value, More than 12 Months | 174,309 | 299,530
Fixed maturity securities, Fair Value, Total | 1,286,920 | 2,237,779
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 22,844 | 57,125
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,042 | 13,285
Fixed maturity securities, Gross Unrealized Losses, Total | 29,886 | 70,410
Equity securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 8,748 | 56,676
Fixed maturity securities, Fair Value, More than 12 Months | 4,863 | 7,956
Fixed maturity securities, Fair Value, Total | 13,611 | 64,632
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 727 | 4,567
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 828 | 1,007
Fixed maturity securities, Gross Unrealized Losses, Total | $ 1,555 | $ 5,574

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