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Investments - Fair Value and Gross Unrealized Losses (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 2,780,337 $ 910,409
Fixed maturity securities, Fair Value, More than 12 Months 431,209 448,829
Fixed maturity securities, Fair Value, Total 3,211,546 1,359,238
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 68,233 8,743
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 26,185 14,044
Fixed maturity securities, Gross Unrealized Losses, Total $ 94,418 $ 22,787
Number of positions with a gross unrealized loss, 12 Months or Less | security 1,091 354
Number of position with a gross unrealized loss, more than 12 months | security 160 158
Number of position with a gross unrealized loss, Total | security 1,251 512
Fair value as a percentage of total fixed maturities and equity securities fair value, 12 Months or Less 36.60% 11.60%
Fair value as a percentage of total fixed maturities and equity securities fair value, more than 12 months 5.70% 5.70%
Fair value as a percentage of total fixed maturities and equity securities fair value, Total 42.30% 17.30%
Mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less $ 354,474 $ 134,032
Fixed maturity securities, Fair Value, More than 12 Months 40,302 40,606
Fixed maturity securities, Fair Value, Total 394,776 174,638
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 12,787 1,053
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 3,805 1,979
Fixed maturity securities, Gross Unrealized Losses, Total 16,592 3,032
Other    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 413,744 168,634
Fixed maturity securities, Fair Value, More than 12 Months 120,081 122,753
Fixed maturity securities, Fair Value, Total 533,825 291,387
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 14,379 1,849
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 9,529 3,667
Fixed maturity securities, Gross Unrealized Losses, Total 23,908 5,516
Municipal bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 269,872 29,437
Fixed maturity securities, Fair Value, More than 12 Months 75,715 79,140
Fixed maturity securities, Fair Value, Total 345,587 108,577
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 6,713 100
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4,406 2,335
Fixed maturity securities, Gross Unrealized Losses, Total 11,119 2,435
Foreign government bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 19,912 0
Fixed maturity securities, Fair Value, More than 12 Months 0 0
Fixed maturity securities, Fair Value, Total 19,912 0
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 584 0
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 0 0
Fixed maturity securities, Gross Unrealized Losses, Total 584 0
Corporate bonds    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 833,370 115,113
Fixed maturity securities, Fair Value, More than 12 Months 36,587 36,081
Fixed maturity securities, Fair Value, Total 869,957 151,194
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 23,370 2,701
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 3,550 1,633
Fixed maturity securities, Gross Unrealized Losses, Total 26,920 4,334
Other mortgage-backed securities    
Fixed maturity securities, Fair Value    
Fixed maturity securities, Fair Value, 12 Months or Less 888,965 457,166
Fixed maturity securities, Fair Value, More than 12 Months 158,524 168,972
Fixed maturity securities, Fair Value, Total 1,047,489 626,138
Fixed maturity securities, Gross Unrealized Losses, 12 Months or Less 10,400 2,791
Fixed maturity securities, Gross Unrealized Losses, More than 12 Months 4,895 4,400
Fixed maturity securities, Gross Unrealized Losses, Total $ 15,295 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