Consolidated Statements Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
REVENUES:
Net premiums written	$ 2,811,515	$ 2,585,635	$ 5,386,339	$ 4,998,889
Change in net unearned premiums	(258,788)	(228,477)	(342,180)	(392,645)
Net premiums earned	2,552,727	2,357,158	5,044,159	4,606,244
Net investment income	245,152	171,574	468,551	345,086
Net realized and unrealized gains (losses) on investments	68,647	(163,935)	91,258	205,947
Change in allowance for expected credit losses on investments	(9,993)	(7,620)	(9,594)	(11,237)
Net investment gains (losses)	58,654	(171,555)	81,664	194,710
Revenues from non-insurance businesses	113,910	128,421	238,110	226,197
Insurance service fees	25,471	26,393	58,328	54,344
Other income	0	896	106	1,716
Total revenues	2,995,914	2,512,887	5,890,918	5,428,297
OPERATING COSTS AND EXPENSES:
Losses and loss expenses	1,569,654	1,435,817	3,108,409	2,775,069
Other operating costs and expenses	823,682	699,819	1,649,255	1,413,718
Expenses from non-insurance businesses	113,538	122,966	236,306	217,822
Interest expense	31,856	31,723	63,692	66,693
Total operating costs and expenses	2,538,730	2,290,325	5,057,662	4,473,302
Income before income taxes	457,184	222,562	833,256	954,995
Income tax expense	(101,460)	(43,095)	(181,803)	(182,499)
Net income before noncontrolling interests	355,724	179,467	651,453	772,496
Noncontrolling interests	584	(145)	(1,019)	(2,536)
Net income to common stockholders	$ 356,308	$ 179,322	$ 650,434	$ 769,960
NET INCOME PER SHARE:
Basic (in dollar per share)	$ 1.32	$ 0.65	$ 2.38	$ 2.78
Diluted (in dollar per share)	$ 1.30	$ 0.64	$ 2.36	$ 2.76