Investments - Schedule of Other Long-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Long-Term Investment [Line Items]
Commercial mortgage loan participations	$ 1,285,697	$ 1,235,759
Other
Long-Term Investment [Line Items]
Commercial mortgage loan participations	42,966	46,259
Investment funds
Long-Term Investment [Line Items]
Commercial mortgage loan participations	1,037,447	986,766
Company-owned life insurance
Long-Term Investment [Line Items]
Commercial mortgage loan participations	$ 205,284	$ 202,734