Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 106,995	$ (139,204)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,580	16,026
Net realized investment (gains) losses	(41,691)	251,320
Increase in premiums receivable	(26,941)	(20,312)
(Increase) decrease in reinsurance recoverables	(5,824)	8,397
Changes in current and deferred income taxes	25,427	(41,501)
Decrease (increase) in deferred policy acquisition costs	3,257	(1,477)
Increase (decrease) in loss and loss adjustment expense reserves	49,796	(23,310)
Increase in unearned premiums	34,561	29,256
(Decrease) increase in accounts payable and accrued expenses	(2,423)	9,640
Share-based compensation	35	35
Other, net	13,747	8,276
Net cash provided by operating activities	174,519	97,146
Fixed maturity securities available for sale in nature:
Purchases	(230,038)	(334,517)
Sales	41,041	23,503
Calls or maturities	103,010	41,643
Equity securities available for sale in nature:
Purchases	(194,929)	(361,942)
Sales	240,657	269,320
Changes in securities payable and receivable	43,436	8,864
(Increase) decrease in short-term investments	(145,159)	254,811
Purchases of fixed assets	(7,929)	(10,305)
Other, net	543	4,790
Net cash used in investing activities	(149,368)	(103,833)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(35,022)	(34,875)
Proceeds from stock options exercised	215	0
Payments on finance lease obligations	(393)	0
Net cash used in financing activities	(35,200)	(34,875)
Net decrease in cash	(10,049)	(41,562)
Cash:
Beginning of the year	348,479	294,398
End of period	338,430	252,836
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	8,275	8,269
Income taxes paid, net	$ 0	$ 0