Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 17,573	$ 78,613
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	28,572	27,525
Net realized investment losses (gains)	44,445	(45,616)
Increase in premiums receivable	(53,220)	(9,929)
Decrease in reinsurance recoverables	8,512	1,419
Changes in current and deferred income taxes	(4,723)	13,674
(Increase) decrease in deferred policy acquisition costs	(11,124)	1,756
Increase in loss and loss adjustment expense reserves	39,237	36,715
Increase in unearned premiums	88,839	19,157
Increase in accounts payable and accrued expenses	25,546	9,068
Share-based compensation	64	56
Other, net	354	42,307
Net cash provided by operating activities	184,075	174,745
Fixed maturity securities available for sale in nature:
Purchases	(393,898)	(440,294)
Sales	118,477	65,211
Calls or maturities	155,614	258,782
Equity securities available for sale in nature:
Purchases	(497,459)	(368,896)
Sales	417,663	303,574
Calls	0	7,100
Changes in securities payable and receivable	12,263	(29,674)
Change in short-term investments and purchased options	31,789	96,406
Purchase of fixed assets	(13,148)	(10,557)
Other, net	6,127	1,387
Net cash used in investing activities	(162,572)	(116,961)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(69,165)	(68,859)
Proceeds from stock options exercised	0	1,171
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	(69,165)	(16,677)
Net (decrease) increase in cash	(47,662)	41,107
Cash:
Beginning of the year	291,413	220,318
End of period	243,751	261,425
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	8,250	1,292
Income taxes paid, net	$ 697	$ 7,063