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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