Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
CASH FROM OPERATING ACTIVITIES:
Net income to common stockholders	$ 417,571	$ 442,471
Adjustments to reconcile net income to net cash from operating activities:
Net investment gains	(16,355)	(25,780)
Depreciation and (accretion) amortization	(9,786)	(80,784)
Noncontrolling interests	(222)	(436)
Investment funds	(27,023)	29,349
Stock incentive plans	12,423	12,979
Change in:
Arbitrage trading account	(13,525)	(14,793)
Premiums and fees receivable	(43,844)	(68,133)
Reinsurance accounts	(42,956)	81,684
Deferred policy acquisition costs	(26,822)	(28,283)
Income taxes	134,962	120,052
Reserves for losses and loss expenses	544,204	393,176
Unearned premiums	113,060	84,952
Other	(297,870)	(200,219)
Net cash from operating activities	743,817	746,235
CASH USED IN INVESTING ACTIVITIES:
Proceeds from sale of fixed maturity securities	290,625	426,084
Proceeds from sale of equity securities	132,663	83,987
Distributions from investment funds	16,295	31,238
Proceeds from maturities and prepayments of fixed maturity securities	1,198,698	968,330
Purchase of fixed maturity securities	(2,486,160)	(2,266,087)
Purchase of equity securities	(56,564)	(105,599)
Real estate purchased	(14,785)	(30,697)
Change in loans receivable	(3,694)	(28,150)
Net purchases of property, furniture and equipment	(16,201)	(54,335)
Change in balances due to security brokers	14,705	70,120
Net cash used in investing activities	(924,418)	(905,109)
CASH USED IN FINANCING ACTIVITIES:
Net proceeds from issuance of debt	1,638	20
Cash dividends to common stockholders	(30,338)	(28,220)
Purchase of common treasury shares	(49,202)	0
Other, net	(3,508)	(1,505)
Net cash used in financing activities	(81,410)	(29,705)
Net impact on cash due to change in foreign exchange rates	7,473	(5,563)
Net change in cash and cash equivalents	(254,538)	(194,142)
Cash and cash equivalents at beginning of period	1,974,747	1,363,195
Cash and cash equivalents at end of period	$ 1,720,209	$ 1,169,053