Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 26,980	$ 23,323
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,265	12,878
Net realized investment gains	(24,460)	(25,057)
Increase in premiums receivable	(19,193)	(29,116)
Changes in current and deferred income taxes	2,568	2,632
Decrease (increase) in deferred policy acquisition costs	1,300	(1,803)
Increase in loss and loss adjustment expense reserves	26,685	28,280
Increase in unearned premiums	20,365	29,258
Increase (decrease) in accounts payable and accrued expenses	9,584	(5,128)
Share-based compensation	35	35
Other, net	17,094	14,483
Net cash provided by operating activities	74,223	49,785
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(278,293)	(386,628)
Fixed maturities available-for-sale in nature: Sales	22,509	149,744
Fixed maturities available-for-sale in nature: Calls or maturities	159,153	180,125
Equity securities available for sale in nature:
Purchases	(195,728)	(163,408)
Sales	142,855	154,273
Changes in securities payable and receivable	(39,264)	(982)
Net decrease in short-term investments and purchased options	115,294	29,086
Purchase of fixed assets	(3,425)	(4,596)
Sale of fixed assets	0	2
Other, net	559	947
Net cash used in investing activities	(76,340)	(41,437)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(34,428)	(34,257)
Employee taxes paid for withheld shares related to share-based compensation	0	(3,203)
Proceeds from stock options exercised	1,171	0
Net proceeds from issuance of senior notes	371,640	0
Payoff of principal on loan and credit facilities	(320,000)	0
Net cash provided by (used in) financing activities	18,383	(37,460)
Net increase (decrease) in cash	16,266	(29,112)
Cash:
Beginning of the year	220,318	264,221
End of period	236,584	235,109
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	1,292	878
Income taxes paid	$ 1,051	$ 79