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Investments (Details 8) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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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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