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Investments (Details 10) (USD $) | Jun. 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 | $ 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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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