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Summary Of Investments Other Than Investments In Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | $ 2,970,470 | $ 3,097,791
Fair value | 3,062,421 | 3,155,257
Amounts in the balance sheet | 3,062,421 | 3,155,257
Fixed Maturity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,345,620 | 2,617,656
Fair value | 2,445,589 | 2,652,280
Amounts in the balance sheet | 2,445,589 | 2,652,280
Fixed Maturity Securities [Member] | U.S. Government Bonds And Agencies [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 14,097 | 8,691
Fair value | 14,298 | 8,805
Amounts in the balance sheet | 14,298 | 8,805
Fixed Maturity Securities [Member] | Municipal Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,186,259 | 2,424,674
Fair value | 2,271,275 | 2,435,213
Amounts in the balance sheet | 2,271,275 | 2,435,213
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 33,008 | 53,185
Fair value | 37,371 | 57,367
Amounts in the balance sheet | 37,371 | 57,367
Fixed Maturity Securities [Member] | Corporate Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 73,009 | 91,859
Fair value | 75,142 | 95,203
Amounts in the balance sheet | 75,142 | 95,203
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 39,247 | 39,247
Fair value | 47,503 | 55,692
Amounts in the balance sheet | 47,503 | 55,692
Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 388,417 | 336,757
Fair value | 380,388 | 359,606
Amounts in the balance sheet | 380,388 | 359,606
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 11,818 | 9,913
Fair value | 11,419 | 9,768
Amounts in the balance sheet | 11,419 | 9,768
Equity Securities [Member] | Private Credit Fund [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 10,000 |
Fair value | 10,008 |
Amounts in the balance sheet | 10,008 |
Equity Securities [Member] | Public Utilities [Member] | Common Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 22,969 | 22,575
Fair value | 26,342 | 27,214
Amounts in the balance sheet | 26,342 | 27,214
Equity Securities [Member] | Banks, Trust, And Insurance Companies [Member] | Common Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 17,495 | 19,052
Fair value | 16,027 | 20,520
Amounts in the balance sheet | 16,027 | 20,520
Equity Securities [Member] | Industrial And Other [Member] | Common Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 326,135 | 285,217
Fair value | 316,592 | 302,104
Amounts in the balance sheet | 316,592 | 302,104
Short-Term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 236,433 | 143,378
Fair value | 236,444 | 143,371
Amounts in the balance sheet | $ 236,444 | $ 143,371

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- Definition This element represents the carrying (reported) amount of the entity's investments as of the balance sheet date. This amount may represent the individual investment's or group of similar investments' original cost, fair value, or such other amount at which the investment is shown in the entity's balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the original cost of the entity's investments including investments in equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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- Definition This item represents the reported amount of the entity's investments measured at fair value. Fair value is the price that would be received to sell an investment in an orderly transaction between market participants at the balance sheet [measurement] date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 15 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 7 -Subparagraph (SX 210.12-15) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611379-123010 + Details
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