Consolidated Statements Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
REVENUES:
Net premiums written	$ 2,848,459	$ 2,577,274	$ 8,234,799	$ 7,576,163
Change in net unearned premiums	(206,545)	(135,313)	(548,726)	(527,958)
Net premiums earned	2,641,914	2,441,961	7,686,073	7,048,205
Net investment income	270,944	202,816	739,494	547,902
Net realized and unrealized (losses) gains on investments	(40,855)	(66,282)	50,403	139,664
Change in allowance for expected credit losses on investments	(1,571)	(1,128)	(11,164)	(12,365)
Net investment (losses) gains	(42,426)	(67,410)	39,239	127,299
Revenues from non-insurance businesses	137,116	119,013	375,225	345,210
Insurance service fees	22,962	27,940	81,290	82,284
Other income	128	80	235	1,797
Total revenues	3,030,638	2,724,400	8,921,556	8,152,697
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,636,193	1,564,578	4,744,602	4,339,646
Other operating costs and expenses	808,669	725,537	2,457,925	2,139,256
Expenses from non-insurance businesses	133,939	116,240	370,244	334,062
Interest expense	31,888	31,780	95,580	98,473
Total operating costs and expenses	2,610,689	2,438,135	7,668,351	6,911,437
Income before income taxes	419,949	286,265	1,253,205	1,241,260
Income tax expense	(86,519)	(55,791)	(268,322)	(238,290)
Net income before noncontrolling interests	333,430	230,474	984,883	1,002,970
Noncontrolling interests	156	(1,595)	(863)	(4,131)
Net income to common stockholders	$ 333,586	$ 228,879	$ 984,020	$ 998,839
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.24	$ 0.83	$ 3.62	$ 3.61
Diluted (in dollar per share)	$ 1.23	$ 0.82	$ 3.59	$ 3.57