Investments (Available-For-Sale Investments) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	$ 5,223,979	$ 5,256,980
Equity securities, Amortized Cost	1,092,662	996,088
Available-for-sale securities, Amortized Cost	6,808,371	6,578,404
Available-for-sale investments, Gross Unrealized Holding Gains	904,292	956,338
Available-for-sale investments, Gross Unrealized Holding Losses	(22,484)	(36,634)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	(12,640)	(19,571)
Total fixed maturities, Estimated Fair Value	5,576,584	5,431,226
Available-for-sale equity investments, Estimated Fair Value	1,609,199	1,721,971
Short-term investments, Estimated Fair Value	491,756	325,340
Available-for-sale investments, Estimated Fair Value	7,677,539	7,478,537
U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	284,438	300,555
Available-for-sale investments, Gross Unrealized Holding Gains	23,733	20,832
Available-for-sale investments, Gross Unrealized Holding Losses	(12)	(49)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Total fixed maturities, Estimated Fair Value	308,159	321,338
Obligations Of States, Municipalities And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	2,743,359	2,767,169
Available-for-sale investments, Gross Unrealized Holding Gains	176,163	61,620
Available-for-sale investments, Gross Unrealized Holding Losses	(1,359)	(29,450)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Total fixed maturities, Estimated Fair Value	2,918,163	2,799,339
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	683,747	550,755
Available-for-sale investments, Gross Unrealized Holding Gains	56,616	24,662
Available-for-sale investments, Gross Unrealized Holding Losses	0	(2,599)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Total fixed maturities, Estimated Fair Value	740,363	572,818
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	392,534	409,415
Available-for-sale investments, Gross Unrealized Holding Gains	31,355	29,664
Available-for-sale investments, Gross Unrealized Holding Losses	(13)	(1,738)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	(5,922)	(11,778)
Total fixed maturities, Estimated Fair Value	417,954	425,563
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	16,723	21,704
Available-for-sale investments, Gross Unrealized Holding Gains	837	1,052
Available-for-sale investments, Gross Unrealized Holding Losses	(8)	0
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Total fixed maturities, Estimated Fair Value	17,552	22,756
Public Utilities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	70,482	95,770
Available-for-sale investments, Gross Unrealized Holding Gains	5,625	6,674
Available-for-sale investments, Gross Unrealized Holding Losses	0	0
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Total fixed maturities, Estimated Fair Value	76,107	102,444
Convertible Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost		16,725
Available-for-sale investments, Gross Unrealized Holding Gains		0
Available-for-sale investments, Gross Unrealized Holding Losses		0
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses		0
Total fixed maturities, Estimated Fair Value		16,725
All Other Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	1,032,696	1,094,887
Available-for-sale investments, Gross Unrealized Holding Gains	74,636	83,752
Available-for-sale investments, Gross Unrealized Holding Losses	(2,328)	(603)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	(6,718)	(7,793)
Total fixed maturities, Estimated Fair Value	1,098,286	1,170,243
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturities, Amortized Cost	5,223,979	5,256,980
Available-for-sale investments, Gross Unrealized Holding Gains	368,965	228,256
Available-for-sale investments, Gross Unrealized Holding Losses	(3,720)	(34,439)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	(12,640)	(19,571)
Total fixed maturities, Estimated Fair Value	5,576,584	5,431,226
Insurance Companies, Banks And Trusts [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Amortized Cost	371,004	388,848
Available-for-sale investments, Gross Unrealized Holding Gains	250,441	323,634
Available-for-sale investments, Gross Unrealized Holding Losses	(9,050)	(1,496)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Available-for-sale equity investments, Estimated Fair Value	612,395	710,986
Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Amortized Cost	721,658	607,240
Available-for-sale investments, Gross Unrealized Holding Gains	284,859	404,444
Available-for-sale investments, Gross Unrealized Holding Losses	(9,713)	(699)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Available-for-sale equity investments, Estimated Fair Value	996,804	1,010,985
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Amortized Cost	1,092,662	996,088
Available-for-sale investments, Gross Unrealized Holding Gains	535,300	728,078
Available-for-sale investments, Gross Unrealized Holding Losses	(18,763)	(2,195)
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Available-for-sale equity investments, Estimated Fair Value	1,609,199	1,721,971
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, Amortized Cost	491,730	325,336
Available-for-sale investments, Gross Unrealized Holding Gains	27	4
Available-for-sale investments, Gross Unrealized Holding Losses	(1)	0
Available-for-sale investments, Unrealized Other-Than-Temporary Impairment Losses	0	0
Short-term investments, Estimated Fair Value	$ 491,756	$ 325,340

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