Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 650,434	$ 769,960
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(81,664)	(194,710)
Depreciation and amortization	6,900	37,238
Noncontrolling interests	1,019	2,536
Investment funds	(993)	(85,874)
Stock incentive plans	25,085	24,158
Change in:
Arbitrage trading account	(30,331)	(27,071)
Premiums and fees receivable	(272,849)	(284,092)
Reinsurance accounts	(242,376)	(111,350)
Deferred policy acquisition costs	(68,414)	(77,561)
Income taxes	(5,703)	(56,725)
Reserves for losses and loss expenses	914,169	788,211
Unearned premiums	398,563	409,450
Other	(139,771)	(188,517)
Net cash from operating activities	1,154,069	1,005,653
CASH USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	623,886	909,295
Proceeds from sale of equity securities	97,916	19,842
Distributions from (contributions to) investment funds	12,963	(142,801)
Proceeds from maturities and prepayments of fixed maturity securities	1,824,819	2,655,789
Purchase of fixed maturity securities	(2,833,467)	(4,860,991)
Purchase of equity securities	(62,485)	(271,296)
Real estate additions	(7,049)	(5,974)
Change in loans receivable	13,767	1,200
Net purchases of property, furniture and equipment	(25,720)	(22,028)
Change in balances due to security brokers	99,976	69,801
Cash received in connection with business disposition	94,076	906,789
Payment for business purchased net of cash acquired	0	(49,572)
Other	127	37
Net cash used in investing activities	(161,191)	(789,909)
CASH USED IN FINANCING ACTIVITIES:
Repayment of senior notes and other debt	(1,954)	(426,503)
Net proceeds from issuance of debt	160	192
Cash dividends to common stockholders	(186,921)	(22,983)
Purchase of common treasury shares	(427,619)	0
Other, net	324	(1,400)
Net cash used in financing activities	(616,010)	(450,694)
Net impact on cash due to change in foreign exchange rates	(2,656)	(17,290)
Net change in cash and cash equivalents	374,212	(252,240)
Cash and cash equivalents at beginning of period	1,449,346	1,568,843
Cash and cash equivalents at end of period	$ 1,823,558	$ 1,316,603