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Investments - Fair Value and Gross Unrealized Losses (Details) $ in Thousands | Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
--- | --- | ---
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 1,004,023 | $ 1,994,925
Fixed maturity securities, Fair Value, More than 12 Months | 240,988 | 307,486
Fixed maturity securities, Fair Value, Total | 1,245,011 | 2,302,411
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 17,809 | 61,692
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,981 | 14,292
Fixed maturity securities, Gross Unrealized Losses, Total | $ 25,790 | $ 75,984
Number of positions with a gross unrealized loss, 12 Months or Less | security | 393 | 629
Number of position with a gross unrealized loss, more than 12 months | security | 77 | 102
Number of position with a gross unrealized loss, Total | security | 470 | 731
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 12.90% | 26.30%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 3.10% | 4.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 16.00% | 30.30%
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 111,456 | $ 186,439
Fixed maturity securities, Fair Value, More than 12 Months | 12,879 | 3,235
Fixed maturity securities, Fair Value, Total | 124,335 | 189,674
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,213 | 6,176
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 858 | 544
Fixed maturity securities, Gross Unrealized Losses, Total | 3,071 | 6,720
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 275,332 | 219,372
Fixed maturity securities, Fair Value, More than 12 Months | 16,979 | 0
Fixed maturity securities, Fair Value, Total | 292,311 | 219,372
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 5,901 | 10,120
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,021 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 6,922 | 10,120
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 118,881 | 408,163
Fixed maturity securities, Fair Value, More than 12 Months | 32,710 | 9,928
Fixed maturity securities, Fair Value, Total | 151,591 | 418,091
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,731 | 19,006
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,697 | 3,582
Fixed maturity securities, Gross Unrealized Losses, Total | 4,428 | 22,588
Foreign government bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 0 | 24,182
Fixed maturity securities, Fair Value, More than 12 Months | 0 | 0
Fixed maturity securities, Fair Value, Total | 0 | 24,182
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 0 | 297
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 0 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 0 | 297
Corporate bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 138,207 | 459,402
Fixed maturity securities, Fair Value, More than 12 Months | 49,931 | 57,261
Fixed maturity securities, Fair Value, Total | 188,138 | 516,663
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,287 | 11,056
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,871 | 3,770
Fixed maturity securities, Gross Unrealized Losses, Total | 4,158 | 14,826
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 349,600 | 640,691
Fixed maturity securities, Fair Value, More than 12 Months | 126,297 | 229,106
Fixed maturity securities, Fair Value, Total | 475,897 | 869,797
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 3,985 | 10,470
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,818 | 5,389
Fixed maturity securities, Gross Unrealized Losses, Total | 5,803 | 15,859
Total Fixed Maturity Securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 993,476 | 1,938,249
Fixed maturity securities, Fair Value, More than 12 Months | 238,796 | 299,530
Fixed maturity securities, Fair Value, Total | 1,232,272 | 2,237,779
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 17,117 | 57,125
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 7,265 | 13,285
Fixed maturity securities, Gross Unrealized Losses, Total | 24,382 | 70,410
Equity securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 10,547 | 56,676
Fixed maturity securities, Fair Value, More than 12 Months | 2,192 | 7,956
Fixed maturity securities, Fair Value, Total | 12,739 | 64,632
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 692 | 4,567
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 716 | 1,007
Fixed maturity securities, Gross Unrealized Losses, Total | $ 1,408 | $ 5,574

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