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Investments (Details 9) (USD $)	Sep. 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	$ 61,400,000	$ 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	848,953,000	1,581,692,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	17,933,000	73,831,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	513,139,000	667,783,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	134,933,000	208,135,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,362,092,000	2,249,475,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	152,866,000	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	734,000	21,178,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	6,000	5,080,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	6,744,000	21,599,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	828,000	5,440,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	7,478,000	42,777,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	834,000	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	695,129,000	1,304,417,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	13,056,000	53,879,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	366,401,000	526,382,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	67,240,000	128,295,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,061,530,000	1,830,799,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	80,296,000	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	153,824,000	277,275,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	4,877,000	19,952,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	146,738,000	141,401,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	67,693,000	79,840,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	300,562,000	418,676,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	72,570,000	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	436,908,000	790,758,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	7,947,000	40,180,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	168,366,000	286,244,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	26,006,000	63,117,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	605,274,000	1,077,002,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	33,953,000	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	133,893,000	212,795,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	4,330,000	10,852,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	63,817,000	47,310,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	6,341,000	11,222,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	197,710,000	260,105,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	10,671,000	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	6,715,000	1,764,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	18,000	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	6,715,000	1,764,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	18,000	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	2,885,000	21,045,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,272,000	1,845,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	18,409,000	12,273,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	4,940,000	1,268,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	21,294,000	33,318,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	6,212,000	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	53,671,000	148,416,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,068,000	1,085,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	16,589,000	16,588,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,025,000	2,491,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	70,260,000	165,004,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	2,093,000	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	0
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0
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	0
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	0
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	117,736,000	109,455,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,350,000	3,538,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	40,110,000	58,979,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	9,546,000	22,001,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	157,846,000	168,434,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	10,896,000	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	12,157,000	34,918,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	492,000	7,220,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	60,373,000	62,357,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	48,867,000	46,730,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	72,530,000	97,275,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	49,359,000	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	21,365,000	128,622,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	113,000	3,549,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	21,236,000	58,388,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	4,763,000	10,382,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	42,601,000	187,010,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	4,876,000	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	7,774,000	23,199,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	55,000	712,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	4,304,000	10,459,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	530,000	1,781,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	12,078,000	33,658,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	585,000	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	55,260,000	101,263,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,286,000	3,592,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	101,691,000	93,910,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	20,960,000	29,036,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	156,951,000	195,173,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	22,246,000	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	0	2,363,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	940,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	18,244,000	21,275,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	11,955,000	20,107,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	18,244,000	23,638,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	11,955,000	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	589,000	3,094,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,000	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	589,000	3,094,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	2,000	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	734,000	19,516,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	6,000	4,478,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	6,744,000	15,694,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	828,000	4,504,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	7,478,000	35,210,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	834,000	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	0	5,905,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	0	936,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	0	7,567,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	$ 0	$ 1,538,000

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