Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 72,649	$ 66,461
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,760	8,817
Net realized investment gains	(46,712)	(44,050)
Bond amortization, net	4,153	2,735
Increase in premiums receivables	(26,448)	(22,916)
Change in current and deferred income taxes	10,643	24,094
Increase in deferred policy acquisition costs	(6,852)	(4,934)
Increase (decrease) in unpaid losses and loss adjustment expenses	5,061	(26,705)
Increase in unearned premiums	39,995	27,944
(Decrease) increase in accounts payable and accrued expenses	(13,626)	17,660
Share-based compensation	398	29
Changes in other payables	(6,820)	(417)
Other, net	10,245	9,480
Net cash provided by operating activities	49,446	58,198
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(177,508)	(209,768)
Fixed maturities available-for-sale in nature: Sales	73,911	9,568
Fixed maturities available-for-sale in nature: Calls or maturities	59,633	81,541
Equity securities available-for-sale in nature:
Purchases	(242,958)	(168,328)
Sales	157,453	160,997
Changes in securities payable and receivable	(678)	(10,449)
Net decrease in short-term investments	12,206	142,368
Purchase of fixed assets	(6,445)	(4,501)
Sale of fixed assets	151	147
Other, net	840	727
Net cash (used in) provided by investing activities	(123,395)	2,302
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(33,811)	(33,641)
Proceeds from stock options exercised	84	0
Proceeds from bank loan	80,000	0
Net cash provided by (used in) financing activities	46,273	(33,641)
Net (decrease) increase in cash	(27,676)	26,859
Cash:
Beginning of the year	266,508	158,183
End of period	238,832	185,042
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	477	368
Income taxes paid	$ 18,737	$ 439