Consolidated Statements Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
REVENUES:
Net premiums written	$ 3,351,439	$ 3,126,779	$ 6,484,742	$ 5,978,070
Change in net unearned premiums	(253,254)	(280,364)	(374,176)	(367,308)
Net premiums earned	3,098,185	2,846,415	6,110,566	5,610,762
Net investment income	379,303	372,129	739,595	691,967
Net realized and unrealized gains (losses) on investments	30,533	(60,306)	46,244	(48,803)
Change in allowance for expected credit losses on investments	440	1,794	1,084	16,070
Net investment gains (losses)	30,973	(58,512)	47,328	(32,733)
Revenues from non-insurance businesses	128,839	125,705	257,748	246,696
Insurance service fees	32,757	27,597	61,686	52,917
Other income	751	698	1,284	1,196
Total revenues	3,670,808	3,314,032	7,218,207	6,570,805
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,955,424	1,780,596	3,856,216	3,444,374
Other operating costs and expenses	1,039,307	892,935	1,989,217	1,761,524
Expenses from non-insurance businesses	122,437	121,120	248,801	239,727
Interest expense	31,777	31,708	63,504	63,436
Total	3,148,945	2,826,359	6,157,738	5,509,061
Income before income taxes	521,863	487,673	1,060,469	1,061,744
Income tax expense	(121,155)	(115,788)	(242,411)	(247,824)
Net income before noncontrolling interests	400,708	371,885	818,058	813,920
Noncontrolling interests	580	24	802	460
Net Income (Loss) to Common Stockholders	$ 401,288	$ 371,909	$ 818,860	$ 814,380
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.01	$ 0.93	$ 2.06	$ 2.03
Diluted (in dollar per share)	$ 1.00	$ 0.92	$ 2.05	$ 2.01