Condensed Financial Information of Registrant (Schedule Of Condensed Financial Information Of Registrant, Statements Of Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net cash used in operating activities	$ 209,804	$ 148,062	$ 158,525
Equity securities:
Purchases	(831,796)	(590,562)	(379,963)
Sales	872,997	277,272	325,562
Increase in payable for securities, net	1,702	1,919	(9,137)
Other, net	1,741	2,255	12,026
Net cash (used in) provided by investing activities	(18,351)	(69,745)	124,615
Cash flows from financing activities:
Dividends paid to shareholders	(134,776)	(134,105)	(132,142)
Excess tax benefit from exercise of stock options	202	86	56
Payment to retire senior notes	0	0	(125,000)
Proceeds from stock options exercised	1,446	2,492	1,951
Proceeds from bank loan	50,000	0	20,000
Net cash used in financing activities	(83,128)	(131,527)	(253,135)
Net increase (decrease) in cash	108,325	(53,210)	30,005
Cash:
Beginning of year	158,183		211,393
End of year	266,508	158,183
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	998	1,690	6,193
Income taxes paid (received)	16,503	18,481	8,503
Parent Company [Member]
Cash flows from operating activities:
Net cash used in operating activities	(843)	(5,590)	(312)
Cash flows from investing activities:
Capital contribution to controlled entities	(40,000)	0	0
Dividends from subsidiaries	120,000	145,000	270,000
Equity securities:
Purchases	(25,038)	(14,102)	(50,056)
Sales	25,798	7,308	43,520
Increase in payable for securities, net	2,489	0	0
Net increase in short-term investments	36,085	(20,413)	(21,451)
Other, net	770	304	1,047
Net cash (used in) provided by investing activities	120,104	118,097	243,060
Cash flows from financing activities:
Dividends paid to shareholders	(134,776)	(134,105)	(132,142)
Excess tax benefit from exercise of stock options	202	86	56
Payment to retire senior notes	0	0	(125,000)
Proceeds from stock options exercised	1,446	2,492	1,951
Proceeds from bank loan	50,000	0	0
Net cash used in financing activities	(83,128)	(131,527)	(255,135)
Net increase (decrease) in cash	36,133	(19,020)	(12,387)
Cash:
Beginning of year	10,199	29,219	41,606
End of year	46,332	10,199	29,219
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	318	0	1,932
Income taxes paid (received)	$ (827)	$ 4,667	$ (1,252)