Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 76,151	$ 125,098
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,730	41,617
Net realized investment losses (gains)	48,355	(66,334)
Increase in premiums receivable	(83,944)	(26,716)
Gain on sale of fixed assets	0	(3,307)
Decrease in reinsurance recoverables	2,930	2,548
Changes in current and deferred income taxes	18,459	18,149
Increase in deferred policy acquisition costs	(18,328)	(1,093)
Increase in loss and loss adjustment expense reserves	69,441	81,916
Increase in unearned premiums	138,849	45,536
Increase in accounts payable and accrued expenses	31,628	19,260
Share-based compensation	104	60
Other, net	(2,180)	39,731
Net cash provided by operating activities	325,195	276,465
Fixed maturity securities available for sale in nature:
Purchases	(547,385)	(527,418)
Sales	148,421	86,970
Calls or maturities	243,982	436,479
Equity securities available for sale in nature:
Purchases	(778,405)	(626,097)
Sales	641,159	480,293
Calls	0	7,100
Changes in securities payable and receivable	13,647	(22,474)
Change in short-term investments and purchased options	39,650	9,186
Purchase of fixed assets	(20,649)	(14,275)
Sale of fixed assets	0	6,239
Other, net	8,064	1,983
Net cash used in investing activities	(251,516)	(162,014)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(103,752)	(103,303)
Proceeds from stock options exercised	340	2,162
Net proceeds from issuance of senior notes	0	371,011
Payoff of principal on loan and credit facilities	0	(320,000)
Net cash used in financing activities	(103,412)	(50,130)
Net (decrease) increase in cash	(29,733)	64,321
Cash:
Beginning of the year	291,413	220,318
End of period	261,680	284,639
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	16,500	9,863
Income taxes (refunded) paid, net	$ (10,778)	$ 14,350