v2.3.0.15

Investments (Summary Of Gross Unrealized Investment Losses By Length Of Time That Securities Have Continuously Been In An Unrealized Loss Position) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	$ 325,526	$ 1,161,448
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(31,135)	(50,890)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	65,721	53,923
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(3,989)	(5,315)
Available-for-sale securities, Estimated Fair Value	391,247	1,215,371
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(35,124)	(56,205)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	6,747	23,574
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(12)	(49)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	0	0
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	0	0
Available-for-sale securities, Estimated Fair Value	6,747	23,574
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(12)	(49)
Obligations Of States, Municipalities And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	2,736	942,935
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(1)	(27,463)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	43,021	22,468
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(1,358)	(1,987)
Available-for-sale securities, Estimated Fair Value	45,757	965,403
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(1,359)	(29,450)
Foreign Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months		119,211
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months		(2,440)
Available-for-sale securities, Estimated Fair Value, 12 months or longer		4,955
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer		(159)
Available-for-sale securities, Estimated Fair Value		124,166
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses		(2,599)
Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	3,893	20,972
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(5,925)	(10,822)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	2,241	10,534
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(10)	(2,694)
Available-for-sale securities, Estimated Fair Value	6,134	31,506
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(5,935)	(13,516)
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	121
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(1)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	35
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(7)
Available-for-sale securities, Estimated Fair Value	156
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(8)
All Other Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	47,893	15,294
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(7,554)	(7,921)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	8,141	15,966
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(1,492)	(475)
Available-for-sale securities, Estimated Fair Value	56,034	31,260
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(9,046)	(8,396)
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	61,390	1,121,986
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(13,493)	(48,695)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	53,438	53,923
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(2,867)	(5,315)
Available-for-sale securities, Estimated Fair Value	114,828	1,175,909
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(16,360)	(54,010)
Insurance Companies, Banks And Trusts [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	56,755	22,750
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(9,050)	(1,496)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	0	0
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	0	0
Available-for-sale securities, Estimated Fair Value	56,755	22,750
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(9,050)	(1,496)
Industrial, Consumer And All Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	117,382	16,712
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(8,591)	(699)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	12,283	0
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(1,122)	0
Available-for-sale securities, Estimated Fair Value	129,665	16,712
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(9,713)	(699)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	174,137	39,462
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(17,641)	(2,195)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	12,283	0
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	(1,122)	0
Available-for-sale securities, Estimated Fair Value	186,420	39,462
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	(18,763)	(2,195)
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Estimated Fair Value, Less than 12 months	89,999
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, Less than 12 months	(1)
Available-for-sale securities, Estimated Fair Value, 12 months or longer	0
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses, 12 months or longer	0
Available-for-sale securities, Estimated Fair Value	89,999
Available-for-sale securities, Gross Unrealized Holding and Other-Than-Temporary Impairment Losses	$ (1)

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