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Investments - Schedule of Contractual Maturities of Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Amortized Cost	$ 2,812,412	$ 2,294,936
Fair Value
Fair Value	2,828,131	2,260,146
Total fixed maturities
Amortized Cost
Amortized Cost	2,306,168	1,867,499
Fair Value
Fair Value	2,320,184	$ 1,831,268
Fixed Maturities, Excluding Mortgage-backed and Asset-backed Securities
Amortized Cost
Due less than one year	149,305
Due after one through five years	1,590,516
Due after five through ten years	224,518
Due after ten years	3,807
Fair Value
Due less than one year	148,136
Due after one through five years	1,607,936
Due after five through ten years	229,859
Due after ten years	3,437
Mortgage-backed securities
Amortized Cost
Mortgage/Asset-backed	297,767
Fair Value
Mortgage/Asset-backed	289,982
Asset-backed securities
Amortized Cost
Mortgage/Asset-backed	40,255
Fair Value
Mortgage/Asset-backed	$ 40,834

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