Investments - Net Investment Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Net Investment Income [Line Items]
Gross investment income		$ 71,456	$ 72,146
Investment expenses	[1]	(2,882)	(2,925)
Net investment income		68,574	69,221
Fixed-maturities
Net Investment Income [Line Items]
Gross investment income		56,714	57,259
Equity securities
Net Investment Income [Line Items]
Gross investment income		2,145	2,539
Residential mortgage loans held for sale
Net Investment Income [Line Items]
Gross investment income	[2]	6,273	1,793
Short-term investments
Net Investment Income [Line Items]
Gross investment income		4,751	8,958
Other
Net Investment Income [Line Items]
Gross investment income	[1]	$ 1,573	$ 1,597

[1] Includes the impact from our securities lending activities. Investment expenses also include other investment management expenses.

[2] See Note 7 for additional information on our residential mortgage loans held for sale.