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Investments (Details 9) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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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 | $ 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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