Investments - Net Investment Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Gross investment income		$ 260,119	$ 276,428	$ 262,024
Investment expenses	[1]	(11,355)	(11,614)	(9,931)
Net investment income		248,764	264,814	252,093
Fixed-maturities
Net Investment Income [Line Items]
Gross investment income		223,271	231,235	225,855
Equity securities
Net Investment Income [Line Items]
Gross investment income		9,024	12,003	13,420
Short-term investments
Net Investment Income [Line Items]
Gross investment income		21,215	26,908	17,460
Other
Net Investment Income [Line Items]
Gross investment income	[1]	$ 6,609	$ 6,282	$ 5,289

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