Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 818,860	$ 814,380
Adjustments to reconcile net income to net cash from operating activities:
Net investment (gains) losses	(47,328)	32,733
Depreciation and (accretion) amortization	(23,755)	(145,062)
Noncontrolling interests	(802)	(460)
Investment funds	(54,291)	3,873
Stock incentive plans	27,487	26,856
Change in:
Arbitrage trading account	(32,970)	51,013
Premiums and fees receivable	(362,327)	(332,640)
Reinsurance accounts	(133,771)	81,755
Deferred policy acquisition costs	(65,570)	(77,772)
Income taxes	28,500	27,699
Reserves for losses and loss expenses	1,067,618	852,523
Unearned premiums	422,524	422,409
Other	(196,551)	(129,742)
Net cash from operating activities	1,447,624	1,627,565
CASH USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	529,223	1,089,183
Proceeds from sale of equity securities	142,927	253,498
Distributions from investment funds	39,421	21,011
Proceeds from maturities and prepayments of fixed maturity securities	2,477,846	2,133,775
Purchase of fixed maturity securities	(4,228,781)	(4,203,540)
Purchase of equity securities	(121,451)	(180,350)
Real estate purchased	(15,950)	(44,603)
Change in loans receivable	109,279	(148,241)
Net purchases of property, furniture and equipment	(36,794)	(78,468)
Change in balances due to security brokers	(54,351)	165,430
Net cash used in investing activities	(1,158,631)	(992,305)
CASH USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	429	420
Cash dividends to common stockholders	(254,175)	(185,721)
Purchase of common treasury shares	(49,202)	(223,763)
Other, net	(10,176)	943
Net cash used in financing activities	(313,124)	(408,121)
Net impact on cash due to change in foreign exchange rates	33,913	(10,064)
Net change in cash and cash equivalents	9,782	217,075
Cash and cash equivalents at beginning of period	1,974,747	1,363,195
Cash and cash equivalents at end of period	$ 1,984,529	$ 1,580,270