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Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Premiums written:
Direct	$ 1,411,730	$ 1,335,475	$ 4,325,386	$ 4,051,124
Assumed	7,542	7,611	18,960	20,009
Ceded	(211,356)	(185,446)	(607,358)	(530,771)
Net	1,207,916	1,157,640	3,736,988	3,540,362
Premiums earned:
Direct	1,387,891	1,279,783	4,101,417	3,727,847
Assumed	6,306	6,972	18,379	18,942
Ceded	(189,519)	(174,527)	(568,304)	(503,386)
Net	1,204,678	1,112,228	3,551,492	3,243,403
Loss and loss expense incurred:
Direct	966,358	1,194,224	2,726,959	2,957,610
Assumed	5,260	6,104	15,895	17,143
Ceded	(152,587)	(434,670)	(353,600)	(579,255)
Net	$ 819,031	$ 765,658	$ 2,389,254	$ 2,395,498

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