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Investments (Details 10) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	$ 67,700,000	$ 68,600,000
Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	902,856,000	1,581,692,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	25,854,000	73,831,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	731,425,000	667,783,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	167,971,000	208,135,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,634,281,000	2,249,475,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	193,825,000	281,966,000
Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	1,743,000	21,178,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	245,000	5,080,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	17,589,000	21,599,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	2,229,000	5,440,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	19,332,000	42,777,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	2,474,000	10,520,000
External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	741,309,000	1,304,417,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	19,814,000	53,879,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	580,068,000	526,382,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	92,949,000	128,295,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,321,377,000	1,830,799,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	112,763,000	182,174,000
External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	161,547,000	277,275,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	6,040,000	19,952,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	151,357,000	141,401,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	75,022,000	79,840,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	312,904,000	418,676,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	81,062,000	99,792,000
Corporate Debt Securities Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	397,287,000	790,758,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	12,765,000	40,180,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	299,074,000	286,244,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	41,570,000	63,117,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	696,361,000	1,077,002,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	54,335,000	103,297,000
Corporate Debt Securities Member | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	135,253,000	212,795,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	4,001,000	10,852,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	49,063,000	47,310,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	7,279,000	11,222,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	184,316,000	260,105,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	11,280,000	22,074,000
US Government Agencies Debt Securities Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	4,004,000	1,764,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	11,000	61,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	4,004,000	1,764,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	11,000	61,000
US States And Political Subdivisions Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	24,191,000	21,045,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,532,000	1,845,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	18,688,000	12,273,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	5,866,000	1,268,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	42,879,000	33,318,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	8,398,000	3,113,000
US States And Political Subdivisions Member | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	0	4,000,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	228,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	0	4,000,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	0	228,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	79,976,000	148,416,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	465,000	1,085,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	33,620,000	16,588,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,449,000	2,491,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	113,596,000	165,004,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	1,914,000	3,576,000
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	11,779,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	625,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	11,779,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	625,000
Commercial Mortgage Backed Securities Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	129,450,000	109,455,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,590,000	3,538,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	73,130,000	58,979,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	12,757,000	22,001,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	202,580,000	168,434,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	15,347,000	25,539,000
Commercial Mortgage Backed Securities Member | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	12,483,000	34,918,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,218,000	7,220,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	73,062,000	62,357,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	51,340,000	46,730,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	85,545,000	97,275,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	52,558,000	53,950,000
Residential Mortgage Backed Securities Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	36,106,000	128,622,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	425,000	3,549,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	54,545,000	58,388,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	6,573,000	10,382,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	90,651,000	187,010,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	6,998,000	13,931,000
Residential Mortgage Backed Securities Member | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	2,025,000	23,199,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	178,000	712,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	9,858,000	10,459,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	782,000	1,781,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	11,883,000	33,658,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	960,000	2,493,000
Asset Backed Securities Member | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	59,722,000	101,263,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	938,000	3,592,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	101,011,000	93,910,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	24,734,000	29,036,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	160,733,000	195,173,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	25,672,000	32,628,000
Asset Backed Securities Member | External Credit Rating Non Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	7,000	2,363,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	18,000	940,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	19,374,000	21,275,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	15,621,000	20,107,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	19,381,000	23,638,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	15,639,000	21,047,000
Canadian Provincial Governments [Member] | External Credit Rating Investment Grade Member | Fixed Maturities Member
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	10,573,000	3,094,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	88,000	29,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	0	0
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	10,573,000	3,094,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	88,000	29,000
Nonredeemable Preferred Stock Member | Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	1,743,000	19,516,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	245,000	4,478,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	17,280,000	15,694,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	2,220,000	4,504,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	19,023,000	35,210,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	2,465,000	8,982,000
Equity Securities Other Member | Equity Securities [Member]
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]
Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value	0	1,662,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	602,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	309,000	5,905,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	9,000	936,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	309,000	7,567,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	$ 9,000	$ 1,538,000

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