Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 217,464	$ 207,864
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	56,864	50,617
Net realized investment (gains) losses	(56,953)	28,458
Increase in premiums receivable	(58,529)	(18,075)
(Increase) decrease in reinsurance recoverables	(1,437)	37,241
Changes in current and deferred income taxes	(22,454)	6,075
Increase in deferred policy acquisition costs	(16,280)	(18,296)
Increase in loss and loss adjustment expense reserves	150,817	20,731
Increase in unearned premiums	139,424	77,002
(Decrease) increase in accounts payable and accrued expenses	(12,958)	38,879
Share-based compensation	106	106
Other, net	31,965	12,650
Net cash provided by operating activities	428,029	443,252
Fixed maturity securities available for sale in nature:
Purchases	(1,044,819)	(686,541)
Sales	117,754	127,336
Calls or maturities	397,524	154,180
Equity securities available for sale in nature:
Purchases	(695,393)	(1,001,624)
Sales	689,484	849,964
Calls	0	3,880
Changes in securities payable and receivable	20,267	11,923
Decrease in short-term investments	213,553	240,673
Purchases of fixed assets	(29,498)	(29,764)
Other, net	1,842	19,078
Net cash used in investing activities	(329,286)	(310,895)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(105,066)	(104,626)
Proceeds from stock options exercised	215	0
Payments on finance lease obligations	(765)	0
Net cash used in financing activities	(105,616)	(104,626)
Net (decrease) increase in cash	(6,873)	27,731
Cash:
Beginning of the year	348,479	294,398
End of period	341,606	322,129
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	16,584	16,573
Income taxes paid, net	$ 69,432	$ 37,453