Investments - Schedule of Changes in Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Percent of total fixed maturities	100.00%		100.00%
Analysis of Changes in Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 395,225	$ 474,114
Included in realized gains / losses	747	(592)
Included in other comprehensive income	(5,364)	(3,257)
Acquisitions	92,311	38,854
Sales	(4,480)	(36,398)
Amortization	(5)	1,906
Other	(5,852)	(23,637)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 472,582	$ 450,990
Percent of total fixed maturities	3.00%	3.00%	2.00%
Analysis of Changes in Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Asset- backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 85,901	$ 11,183
Included in realized gains / losses	0	0
Included in other comprehensive income	177	71
Acquisitions	45,334	21,339
Sales	0	0
Amortization	0	0
Other	(1,436)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 129,976	$ 32,593
Percent of total fixed maturities	1.00%	0.00%
Analysis of Changes in Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Collateralized Debt Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 0	$ 42,866
Included in realized gains / losses	0	(588)
Included in other comprehensive income	0	0
Acquisitions	0	0
Sales	0	(36,398)
Amortization	0	1,893
Other	0	(7,773)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 0	$ 0
Percent of total fixed maturities	0.00%	0.00%
Analysis of Changes in Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| States, Municipalities and Political Subdivisions Debt Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 0	$ 0
Included in realized gains / losses	0	0
Included in other comprehensive income	0	0
Acquisitions	2,977	0
Sales	0	0
Amortization	0	0
Other	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 2,977	$ 0
Percent of total fixed maturities	0.00%	0.00%
Analysis of Changes in Fair Value Measurements Using Significant Unobservable Inputs (Level 3) \| Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 309,324	$ 420,065
Included in realized gains / losses	747	(4)
Included in other comprehensive income	(5,541)	(3,328)
Acquisitions	44,000	17,515
Sales	(4,480)	0
Amortization	(5)	13
Other	(4,416)	(15,864)
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	$ 339,629	$ 418,397
Percent of total fixed maturities	2.00%	3.00%

Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, amortization.

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Other adjustments, including capitalized interest and foreign exchange.

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Percent Of Available-For-Sale Securities At Fair Value By Valuation Level

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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