Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 216,176	$ 89,007
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	36,842	32,982
Net realized investment (gains) losses	(100,496)	92,894
(Increase) decrease in premiums receivable	(26,634)	271
(Increase) decrease in reinsurance recoverables	(4,217)	28,566
Changes in current and deferred income taxes	435	(4,338)
Increase in deferred policy acquisition costs	(3,829)	(9,574)
Increase (decrease) in loss and loss adjustment expense reserves	99,711	(56,145)
Increase in unearned premiums	65,251	34,492
Increase in accounts payable and accrued expenses	375	48,778
Share-based compensation	70	70
Other, net	33,557	2,580
Net cash provided by operating activities	317,241	259,583
Fixed maturity securities available for sale in nature:
Purchases	(574,598)	(449,641)
Sales	86,022	106,986
Calls or maturities	225,650	84,238
Equity securities available for sale in nature:
Purchases	(434,406)	(680,955)
Sales	466,292	564,635
Calls	0	3,000
Changes in securities payable and receivable	32,107	(2,219)
(Increase) decrease in short-term investments	(1,126)	159,112
Purchases of fixed assets	(17,802)	(19,789)
Other, net	973	12,555
Net cash used in investing activities	(216,888)	(222,078)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(70,044)	(69,750)
Proceeds from stock options exercised	215	0
Payments on finance lease obligations	(388)	0
Net cash used in financing activities	(70,217)	(69,750)
Net increase (decrease) in cash	30,136	(32,245)
Cash:
Beginning of the year	348,479	294,398
End of period	378,615	262,153
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	8,303	8,298
Income taxes paid, net	$ 51,209	$ 20,091