Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 984,020	$ 998,839
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(39,239)	(127,299)
Depreciation and amortization	3,294	46,037
Noncontrolling interests	863	4,131
Investment funds	(5,444)	(121,919)
Stock incentive plans	37,796	36,247
Change in:
Arbitrage trading account	(41,399)	(39,389)
Premiums and fees receivable	(340,056)	(247,782)
Reinsurance accounts	(194,610)	(187,453)
Deferred policy acquisition costs	(93,270)	(92,724)
Income taxes	49,722	(111,231)
Reserves for losses and loss expenses	1,288,975	1,225,679
Unearned premiums	608,300	551,894
Other	(27,790)	(161,727)
Net cash from operating activities	2,231,162	1,773,303
CASH USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	877,019	1,638,049
Proceeds from sale of equity securities	161,470	20,057
Distributions from (contributions to) investment funds	8,385	(72,925)
Proceeds from maturities and prepayments of fixed maturity securities	2,654,140	3,916,331
Purchase of fixed maturity securities	(5,091,866)	(7,694,663)
Purchase of equity securities	(63,815)	(340,158)
Real estate additions	(15,158)	(18,670)
Change in loans receivable	12,796	2,066
Net purchases of property, furniture and equipment	(42,127)	(35,270)
Change in balances due to security brokers	8,224	177,457
Cash received in connection with business disposition	94,076	906,789
Payment for business purchased net of cash acquired	0	(49,572)
Other	320	94
Net cash used in investing activities	(1,396,536)	(1,550,415)
CASH USED IN FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(1,954)	(426,503)
Net proceeds from issuance of debt	1,100	2,181
Cash dividends to common stockholders	(186,921)	(182,147)
Purchase of common treasury shares	(430,536)	(6,570)
Other, net	(20,545)	(21,808)
Net cash used in financing activities	(638,856)	(634,847)
Net impact on cash due to change in foreign exchange rates	959	(26,134)
Net change in cash and cash equivalents	196,728	(438,093)
Cash and cash equivalents at beginning of period	1,449,346	1,568,843
Cash and cash equivalents at end of period	$ 1,646,074	$ 1,130,750