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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 1,984,310 $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months 418,313 448,829
Fixed maturity securities, Fair Value, Total 2,402,623 1,359,238
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 40,732 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 23,018 14,044
Fixed maturity securities, Gross Unrealized Losses, Total $ 63,750 $ 22,787
Number of positions with a gross unrealized loss, 12 Months or Less | security 837 354
Number of position with a gross unrealized loss, more than 12 months | security 153 158
Number of position with a gross unrealized loss, Total | security 990 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less 25.60% 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months 5.40% 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total 31.00% 17.30%
Mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 301,927 $ 134,032
Fixed maturity securities, Fair Value, More than 12 Months 39,339 40,606
Fixed maturity securities, Fair Value, Total 341,266 174,638
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 8,346 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 3,255 1,979
Fixed maturity securities, Gross Unrealized Losses, Total 11,601 3,032
Other    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 393,555 168,634
Fixed maturity securities, Fair Value, More than 12 Months 118,166 122,753
Fixed maturity securities, Fair Value, Total 511,721 291,387
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 9,415 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 7,805 3,667
Fixed maturity securities, Gross Unrealized Losses, Total 17,220 5,516
Municipal bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 224,400 29,437
Fixed maturity securities, Fair Value, More than 12 Months 76,577 79,140
Fixed maturity securities, Fair Value, Total 300,977 108,577
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 4,614 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4,902 2,335
Fixed maturity securities, Gross Unrealized Losses, Total 9,516 2,435
Foreign government bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 6,390 0
Fixed maturity securities, Fair Value, More than 12 Months 0 0
Fixed maturity securities, Fair Value, Total 6,390 0
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 136 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0 0
Fixed maturity securities, Gross Unrealized Losses, Total 136 0
Corporate bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 450,467 115,113
Fixed maturity securities, Fair Value, More than 12 Months 37,572 36,081
Fixed maturity securities, Fair Value, Total 488,039 151,194
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 11,923 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 2,652 1,633
Fixed maturity securities, Gross Unrealized Losses, Total 14,575 4,334
Other mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 607,571 457,166
Fixed maturity securities, Fair Value, More than 12 Months 146,659 168,972
Fixed maturity securities, Fair Value, Total 754,230 626,138
Fixed maturity securities, Gross Unrealized Losses    
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 6,298 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4,404 4,400
Fixed maturity securities, Gross Unrealized Losses, Total $ 10,702 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    
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    
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