Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 72,196	$ 35,804
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,858	13,750
Net realized investment (gains) losses	(70,438)	49,309
Bond amortization, net	13,060	11,348
Excess tax benefit from exercise of stock options	(904)	(106)
Increase in premium receivables	(23,456)	(18,761)
Change in current and deferred income taxes	17,871	(24,080)
Increase in deferred policy acquisition costs	(2,231)	(2,103)
Increase in losses and loss adjustment expense reserves	64,104	3,458
Increase in unearned premiums	30,824	19,853
Decrease in accounts payable and accrued expenses	(6,166)	(28,778)
Share-based compensation	(3,441)	2,396
Changes in other payables	(3,098)	9,668
Other, net	506	1,431
Net cash provided by operating activities	101,685	73,189
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(491,231)	(519,337)
Fixed maturities available-for-sale in nature: Sales	172,490	69,834
Fixed maturities available-for-sale in nature: Calls or maturities	288,257	141,144
Equity securities available-for-sale in nature:
Purchases	(337,598)	(408,862)
Sales	310,369	481,773
Calls	0	2,378
Changes in securities payable and receivable	(2,388)	(6,784)
Net decrease in short-term investments and purchased options	1,677	219,485
Purchase of fixed assets	(8,935)	(11,298)
Sale of fixed assets	2	104
Business acquisition, net of cash acquired	0	7,771
Other, net	2,343	1,381
Net cash used in investing activities	(65,014)	(22,411)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(68,515)	(68,120)
Excess tax benefit from exercise of stock options	904	106
Proceeds from stock options exercised	0	2,111
Net cash used in financing activities	(67,611)	(65,903)
Net decrease in cash	(30,940)	(15,125)
Cash:
Beginning of the year	264,221	289,907
End of period	233,281	274,782
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	1,820	1,440
Income taxes paid	$ 273	$ 22,647