Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 135,867	$ (42,607)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,085	14,148
Net realized investment (gains) losses	(111,074)	58,735
Increase in premiums receivable	(24,923)	(35,117)
Decrease in reinsurance recoverables	106,588	3,673
Changes in current and deferred income taxes	31,338	(17,087)
Increase in deferred policy acquisition costs	(4,592)	(4,058)
(Decrease) increase in loss and loss adjustment expense reserves	(41,800)	20,360
Increase in unearned premiums	37,480	48,417
Increase in accounts payable and accrued expenses	22,742	24,761
Share-based compensation	16	23
Other, net	7,960	7,103
Net cash provided by operating activities	174,687	78,351
Fixed maturity securities available for sale in nature:
Purchases	(146,592)	(213,947)
Sales	15,197	60,238
Calls or maturities	80,099	62,673
Equity securities available for sale in nature:
Purchases	(256,696)	(249,177)
Sales	227,787	221,616
Changes in securities payable and receivable	15,901	19,537
(Increase) decrease in short-term investments	(113,287)	57,110
Purchases of fixed assets	(8,430)	(6,206)
Other, net	1,421	3,044
Net cash used in investing activities	(184,600)	(45,112)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(34,726)	(34,582)
Proceeds from stock options exercised	453	0
Net cash used in financing activities	(34,273)	(34,582)
Net decrease in cash	(44,186)	(1,343)
Cash:
Beginning of the year	314,291	291,413
End of period	270,105	290,070
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	8,268	8,250
Income taxes refunded, net	$ 36	$ 6