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Investments - Gross Unrealized Losses of Fixed Maturities and Equity Securities in Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 910,409 | $ 1,994,925
Fixed maturity securities, Fair Value, More than 12 Months | 448,829 | 307,486
Fixed maturity securities, Fair Value, Total | 1,359,238 | 2,302,411
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 8,743 | 61,692
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 14,044 | 14,292
Fixed maturity securities, Gross Unrealized Losses, Total | $ 22,787 | $ 75,984
Number of positions with a gross unrealized loss position, 12 Months or Less | security | 354 | 629
Number of position with a gross unrealized loss position, more than 12 months | security | 158 | 102
Number of position with a gross unrealized loss position, Total | security | 512 | 731
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less | 11.60% | 26.30%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months | 5.70% | 4.00%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total | 17.30% | 30.30%
Total fixed maturity securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | $ 904,382 | $ 1,938,249
Fixed maturity securities, Fair Value, More than 12 Months | 447,552 | 299,530
Fixed maturity securities, Fair Value, Total | 1,351,934 | 2,237,779
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 8,494 | 57,125
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 14,014 | 13,285
Fixed maturity securities, Gross Unrealized Losses, Total | 22,508 | 70,410
Mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 134,032 | 76,573
Fixed maturity securities, Fair Value, More than 12 Months | 40,606 | 3,235
Fixed maturity securities, Fair Value, Total | 174,638 | 79,808
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1,053 | 3,096
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,979 | 544
Fixed maturity securities, Gross Unrealized Losses, Total | 3,032 | 3,640
Other |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 168,634 | 219,372
Fixed maturity securities, Fair Value, More than 12 Months | 122,753 | 0
Fixed maturity securities, Fair Value, Total | 291,387 | 219,372
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 1,849 | 10,120
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 3,667 | 0
Fixed maturity securities, Gross Unrealized Losses, Total | 5,516 | 10,120
Municipal bonds |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 29,437 | 408,163
Fixed maturity securities, Fair Value, More than 12 Months | 79,140 | 9,928
Fixed maturity securities, Fair Value, Total | 108,577 | 418,091
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 100 | 19,006
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 2,335 | 3,582
Fixed maturity securities, Gross Unrealized Losses, Total | 2,435 | 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 | 115,113 | 459,402
Fixed maturity securities, Fair Value, More than 12 Months | 36,081 | 57,261
Fixed maturity securities, Fair Value, Total | 151,194 | 516,663
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,701 | 11,056
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 1,633 | 3,770
Fixed maturity securities, Gross Unrealized Losses, Total | 4,334 | 14,826
Other mortgage-backed securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 457,166 | 750,557
Fixed maturity securities, Fair Value, More than 12 Months | 168,972 | 229,106
Fixed maturity securities, Fair Value, Total | 626,138 | 979,663
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 2,791 | 13,550
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 4,400 | 5,389
Fixed maturity securities, Gross Unrealized Losses, Total | 7,191 | 18,939
Equity securities |  |
Fixed maturity securities, Fair Value |  |
Fixed maturity securities, Fair Value, 12 Months or Less | 6,027 | 56,676
Fixed maturity securities, Fair Value, More than 12 Months | 1,277 | 7,956
Fixed maturity securities, Fair Value, Total | 7,304 | 64,632
Fixed maturity securities, Gross Unrealized Losses |  |
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less | 249 | 4,567
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months | 30 | 1,007
Fixed maturity securities, Gross Unrealized Losses, Total | $ 279 | $ 5,574

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