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Investments (Details 8) (USD $)	Mar. 31, 2013	Dec. 31, 2012
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	$ 46,300,000	$ 61,500,000
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	2,079,630,000	1,445,262,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	34,480,000	22,324,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	365,855,000	414,211,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	86,215,000	109,930,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	2,445,485,000	1,859,473,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	120,695,000	132,254,000
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	118,072,000	90,951,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,836,000	1,186,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,000	5,679,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,000	118,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	118,073,000	96,630,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	1,837,000	1,304,000
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	1,894,982,000	1,242,157,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	31,018,000	18,284,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	234,367,000	272,112,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	34,495,000	42,960,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	2,129,349,000	1,514,269,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	65,513,000	61,244,000
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	184,648,000	203,105,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	3,462,000	4,040,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	131,488,000	142,099,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	51,720,000	66,970,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	316,136,000	345,204,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	55,182,000	71,010,000
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	1,187,238,000	786,203,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	25,066,000	13,276,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	89,284,000	108,187,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	11,614,000	17,386,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	1,276,522,000	894,390,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	36,680,000	30,662,000
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	155,261,000	181,168,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,961,000	3,170,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	30,763,000	39,123,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	5,452,000	5,501,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	186,024,000	220,291,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	8,413,000	8,671,000
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	56,975,000	7,272,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	132,000	24,000
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	56,975,000	7,272,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	132,000	24,000
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	30,734,000	20,602,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	266,000	1,514,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	11,463,000	11,736,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	5,480,000	4,132,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	42,197,000	32,338,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	5,746,000	5,646,000
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	0
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	0
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	0
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	0	0
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	335,216,000	244,817,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	2,809,000	1,953,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	7,375,000	7,435,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	744,000	761,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	342,591,000	252,252,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	3,553,000	2,714,000
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	1,034,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	32,000
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	1,034,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	32,000
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	79,509,000	89,507,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	471,000	797,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	21,920,000	29,181,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	6,521,000	7,974,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	101,429,000	118,688,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	6,992,000	8,771,000
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	0	3,317,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	0	764,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	66,674,000	68,405,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	34,904,000	42,307,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	66,674,000	71,722,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	34,904,000	43,071,000
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	54,738,000	22,288,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	469,000	97,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	17,664,000	19,394,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	2,920,000	3,199,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	72,402,000	41,682,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	3,389,000	3,296,000
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	18,215,000	15,199,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	298,000	80,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	4,681,000	2,633,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	354,000	347,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	22,896,000	17,832,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	652,000	427,000
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	91,530,000	59,119,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	672,000	449,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	86,661,000	96,179,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	7,216,000	9,508,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	178,191,000	155,298,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	7,888,000	9,957,000
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	10,138,000	3,421,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	171,000	26,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	29,370,000	31,938,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	11,010,000	18,815,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	39,508,000	35,359,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	11,181,000	18,841,000
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	59,042,000	12,349,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,133,000	174,000
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	59,042,000	12,349,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	1,133,000	174,000
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	7,885,000	5,577,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	7,000	52,000
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value	1,000	5,679,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses 1	1,000	118,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value	7,886,000	11,256,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	8,000	170,000
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	110,187,000	85,374,000
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses 1	1,829,000	1,134,000
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	110,187,000	85,374,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses 1	$ 1,829,000	$ 1,134,000

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