Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 338,547	$ 366,886
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53,720	53,844
Net realized investment gains	(131,251)	(155,536)
Net gains on sales of fixed assets	(2,690)	(20,113)
Loss on property held for sale	0	6,420
Increase in premiums receivable	(81,435)	(123,554)
(Increase) decrease in reinsurance recoverables	(147,156)	3,928
Changes in current and deferred income taxes	79,095	40,583
Increase in deferred policy acquisition costs	(27,554)	(47,562)
Increase in loss and loss adjustment expense reserves	443,941	287,988
Increase in unearned premiums	233,701	341,250
Increase in accounts payable and accrued expenses	6,465	54,559
Other, net	33,932	(19,894)
Net cash provided by operating activities	799,315	788,799
Fixed maturity securities available for sale in nature:
Purchases	(1,318,484)	(1,221,342)
Sales	421,353	163,105
Calls or maturities	669,936	562,132
Equity securities available for sale in nature:
Purchases	(1,452,843)	(1,276,932)
Sales	1,681,568	1,193,926
Calls	0	7,185
Changes in securities payable and receivable	(19,837)	14,026
Increase in short-term investments	(189,066)	(99,233)
Purchases of fixed assets	(44,416)	(33,814)
Sales of fixed assets	34,153	12,707
Other, net	4,710	8,966
Net cash used in investing activities	(212,926)	(669,274)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(52,757)	(52,741)
Payments on finance lease obligations	(1,314)	(1,412)
Net cash used in financing activities	(54,071)	(54,153)
Net increase in cash	532,318	65,372
Cash:
Beginning of the year	720,257	550,903
End of period	1,252,575	616,275
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	25,362	26,783
Income taxes (refunded) paid, net	$ (2,877)	$ 43,912