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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