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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, gross balance		$ 112,441		$ 112,441
Accumulated impairment		(46,707)		(46,707)
Additions	$ 125,408
Goodwill, net balance	191,142		$ 65,734
Accident and Health
Goodwill [Roll Forward]
Goodwill, gross balance		91,577		91,577
Accumulated impairment		(44,821)		(44,821)
Additions	0
Goodwill, net balance	46,756		46,756
Credit & Surety
Goodwill [Roll Forward]
Goodwill, gross balance		6,781		6,781
Accumulated impairment		0		0
Additions	0
Goodwill, net balance	6,781		6,781
Energy Solutions
Goodwill [Roll Forward]
Goodwill, gross balance		10,204		10,204
Accumulated impairment		0		0
Additions	0
Goodwill, net balance	10,204		10,204
Apollo
Goodwill [Roll Forward]
Goodwill, gross balance		0
Accumulated impairment		0
Additions	125,408
Goodwill, net balance	125,408
Other
Goodwill [Roll Forward]
Goodwill, gross balance		3,879		3,879
Accumulated impairment		$ (1,886)		$ (1,886)
Additions	0
Goodwill, net balance	$ 1,993		$ 1,993