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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 3,016,397 $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months 682,467 448,829
Fixed maturity securities, Fair Value, Total 3,698,864 1,359,238
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 77,130 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 46,434 14,044
Fixed maturity securities, Gross Unrealized Losses, Total $ 123,564 $ 22,787
Number of positions with a gross unrealized loss, 12 Months or Less | security 1,237 354
Number of position with a gross unrealized loss, more than 12 months | security 246 158
Number of position with a gross unrealized loss, Total | security 1,483 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less 39.40% 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months 8.90% 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total 48.30% 17.30%
Mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 330,285 $ 134,032
Fixed maturity securities, Fair Value, More than 12 Months 99,483 40,606
Fixed maturity securities, Fair Value, Total 429,768 174,638
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 13,484 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 9,725 1,979
Fixed maturity securities, Gross Unrealized Losses, Total 23,209 3,032
Other    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 450,713 168,634
Fixed maturity securities, Fair Value, More than 12 Months 163,569 122,753
Fixed maturity securities, Fair Value, Total 614,282 291,387
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 18,510 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 13,926 3,667
Fixed maturity securities, Gross Unrealized Losses, Total 32,436 5,516
Municipal bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 491,680 29,437
Fixed maturity securities, Fair Value, More than 12 Months 75,678 79,140
Fixed maturity securities, Fair Value, Total 567,358 108,577
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 13,484 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 6,224 2,335
Fixed maturity securities, Gross Unrealized Losses, Total 19,708 2,435
Foreign government bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 19,856 0
Fixed maturity securities, Fair Value, More than 12 Months 0 0
Fixed maturity securities, Fair Value, Total 19,856 0
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 644 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0 0
Fixed maturity securities, Gross Unrealized Losses, Total 644 0
Corporate bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 821,190 115,113
Fixed maturity securities, Fair Value, More than 12 Months 90,998 36,081
Fixed maturity securities, Fair Value, Total 912,188 151,194
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 20,801 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 8,564 1,633
Fixed maturity securities, Gross Unrealized Losses, Total 29,365 4,334
Other mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 902,673 457,166
Fixed maturity securities, Fair Value, More than 12 Months 252,739 168,972
Fixed maturity securities, Fair Value, Total 1,155,412 626,138
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 10,207 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 7,995 4,400
Fixed maturity securities, Gross Unrealized Losses, Total $ 18,202 7,191
Total Fixed Maturity Securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less   904,382
Fixed maturity securities, Fair Value, More than 12 Months   447,552
Fixed maturity securities, Fair Value, Total   1,351,934
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less   8,494
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months   14,014
Fixed maturity securities, Gross Unrealized Losses, Total   22,508
Equity securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less   6,027
Fixed maturity securities, Fair Value, More than 12 Months   1,277
Fixed maturity securities, Fair Value, Total   7,304
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less   249
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months   30
Fixed maturity securities, Gross Unrealized Losses, Total   $ 279