Summary of Investments - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 93,954
Due after one year through five years	469,466
Due after five years through 10 years	471,780
Due after 10 years	299,960
Amortized Cost	1,683,486	$ 1,771,041
Fair Value
Due in one year or less	93,317
Due after one year through five years	458,561
Due after five years through 10 years	442,802
Due after 10 years	281,229
Fair Value	1,589,248	1,686,502
Fixed Maturities
Amortized Cost
Amortized Cost	1,683,486
Fair Value
Fair Value	1,589,248
Asset-backed securities
Amortized Cost
Securities not categorized by contractual maturity	3,214
Amortized Cost	3,214	3,394
Fair Value
Securities not categorized by contractual maturity	3,061
Mortgage-backed securities
Amortized Cost
Securities not categorized by contractual maturity	55,865
Amortized Cost	55,865	$ 23,800
Fair Value
Securities not categorized by contractual maturity	53,197
Collateralized mortgage obligations
Amortized Cost
Securities not categorized by contractual maturity	289,247
Fair Value
Securities not categorized by contractual maturity	$ 257,081

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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