Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 23,323	$ 26,165
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,357	7,107
Net realized investment (gains) losses	(25,057)	9,961
Bond amortization, net	6,521	5,213
Excess tax benefit from exercise of stock options	(904)	(82)
Increase in premium receivables	(29,116)	(22,214)
Change in current and deferred income taxes	2,632	(6,102)
Increase in deferred policy acquisition costs	(1,803)	(1,899)
Increase (decrease) in losses and loss adjustment expense reserves	28,280	(4,597)
Increase in unearned premiums	29,258	18,866
Decrease in accounts payable and accrued expenses	(5,128)	(38,258)
Share-based compensation	(3,477)	1,043
Changes in other payables	1,598	7,543
Other, net	13,195	8,706
Net cash provided by operating activities	45,679	11,452
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(386,628)	(374,582)
Fixed maturities available-for-sale in nature: Sales	149,744	16,733
Fixed maturities available-for-sale in nature: Calls or maturities	180,125	87,365
Equity securities available-for-sale in nature:
Purchases	(163,408)	(246,085)
Sales	154,273	267,175
Changes in securities payable and receivable	(982)	13,638
Net decrease in short-term investments and purchased options	29,086	198,620
Purchase of fixed assets	(4,596)	(5,928)
Sale of fixed assets	2	58
Business acquisition, net of cash acquired	0	7,771
Other, net	947	1,142
Net cash used in investing activities	(41,437)	(34,093)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(34,257)	(34,055)
Excess tax benefit from exercise of stock options	903	82
Proceeds from stock options exercised	0	1,283
Net cash used in financing activities	(33,354)	(32,690)
Net decrease in cash	(29,112)	(55,331)
Cash:
Beginning of the year	264,221	289,907
End of period	235,109	234,576
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	878	692
Income taxes paid	$ 79	$ 9,798