Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 125,098	$ 99,126
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41,617	39,580
Net realized investment gains	(66,334)	(54,973)
Increase in premiums receivable	(26,716)	(37,965)
Gain on sale of fixed assets	(3,307)	0
Changes in current and deferred income taxes	18,149	22,494
Increase in deferred policy acquisition costs	(1,093)	(4,995)
Increase in loss and loss adjustment expense reserves	81,916	97,865
Increase in unearned premiums	45,536	52,838
Increase (decrease) in accounts payable and accrued expenses	19,260	(2,172)
Share-based compensation	60	107
Other, net	42,279	1,910
Net cash provided by operating activities	276,465	213,815
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(527,418)	(742,671)
Fixed maturities available-for-sale in nature: Sales	86,970	230,909
Fixed maturities available-for-sale in nature: Calls or maturities	436,479	421,737
Equity securities available for sale in nature:
Equity securities available for sale in nature: Purchases	(626,097)	(535,155)
Equity securities available for sale in nature: Sales	480,293	499,126
Equity securities available for sale in nature: Calls	7,100	0
Changes in securities payable and receivable	(22,474)	17,272
Changes in short-term investments and purchased options	11,169	(24,366)
Purchase of fixed assets	(14,275)	(12,874)
Sale of fixed assets	6,239	3
Other, net	0	3,186
Net cash used in investing activities	(162,014)	(142,833)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(103,303)	(102,783)
Employee taxes paid with shares related to share-based compensation	0	(3,269)
Proceeds from stock options exercised	2,162	706
Net proceeds from issuance of senior notes	371,011	0
Payoff of principal on loan and credit facilities	(320,000)	0
Net cash used in financing activities	(50,130)	(105,346)
Net increase (decrease) in cash	64,321	(34,364)
Cash:
Beginning of the year	220,318	264,221
End of period	284,639	229,857
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	9,863	2,797
Income taxes paid	$ 14,350	$ 374