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Summary Of Investments Other Than Investments In Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Fixed Maturity Securities [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] | Dec. 31, 2012 Fixed Maturity Securities [Member] U.S. Government Bonds And Agencies [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] U.S. Government Bonds And Agencies [Member] | Dec. 31, 2012 Fixed Maturity Securities [Member] Municipal Securities [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] Municipal Securities [Member] | Dec. 31, 2012 Fixed Maturity Securities [Member] Mortgage-Backed Securities [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] Mortgage-Backed Securities [Member] | Dec. 31, 2012 Fixed Maturity Securities [Member] Corporate Securities [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] Corporate Securities [Member] | Dec. 31, 2012 Fixed Maturity Securities [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2011 Fixed Maturity Securities [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2012 Equity Securities [Member] | Dec. 31, 2011 Equity Securities [Member] | Dec. 31, 2012 Equity Securities [Member] Non-Redeemable Preferred Stock [Member] | Dec. 31, 2010 Equity Securities [Member] Non-Redeemable Preferred Stock [Member] | Dec. 31, 2012 Equity Securities [Member] Partnership Interest in a Private Credit Fund [Member] | Dec. 31, 2010 Equity Securities [Member] Partnership Interest in a Private Credit Fund [Member] | Dec. 31, 2012 Equity Securities [Member] Public Utilities [Member] Common Stock [Member] | Dec. 31, 2010 Equity Securities [Member] Public Utilities [Member] Common Stock [Member] | Dec. 31, 2012 Equity Securities [Member] Banks, Trust, And Insurance Companies [Member] Common Stock [Member] | Dec. 31, 2010 Equity Securities [Member] Banks, Trust, And Insurance Companies [Member] Common Stock [Member] | Dec. 31, 2012 Equity Securities [Member] Energy and Other [Member] Common Stock [Member] | Dec. 31, 2010 Equity Securities [Member] Energy and Other [Member] Common Stock [Member] | Dec. 31, 2012 Short-Term Investments [Member] | Dec. 31, 2010 Short-Term Investments [Member]
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | $ 3,041,469 | $ 2,970,470 | $ 2,270,903 | $ 2,345,620 | $ 13,999 | $ 14,097 | $ 2,040,537 | $ 2,186,259 | $ 27,786 | $ 33,008 | $ 151,019 | $ 73,009 | $ 37,562 | $ 39,247 | $ 475,959 | $ 388,417 | $ 10,895 | $ 11,818 | $ 10,000 | $ 10,000 | $ 82,474 | $ 22,969 | $ 19,701 | $ 17,495 | $ 352,889 | $ 326,135 | $ 294,607 | $ 236,433
Fair value | 3,180,095 | 3,062,421 | 2,408,354 | 2,445,589 | 14,204 | 14,298 | 2,165,095 | 2,271,275 | 30,703 | 37,371 | 155,551 | 75,142 | 42,801 | 47,503 | 477,088 | 380,388 | 11,701 | 11,419 | 11,306 | 10,008 | 85,106 | 26,342 | 22,166 | 16,027 | 346,809 | 316,592 | 294,653 | 236,444
Amounts in the balance sheet | $ 3,180,095 | $ 3,062,421 | $ 2,408,354 | $ 2,445,589 | $ 14,204 | $ 14,298 | $ 2,165,095 | $ 2,271,275 | $ 30,703 | $ 37,371 | $ 155,551 | $ 75,142 | $ 42,801 | $ 47,503 | $ 477,088 | $ 380,388 | $ 11,701 | $ 11,419 | $ 11,306 | $ 10,008 | $ 85,106 | $ 26,342 | $ 22,166 | $ 16,027 | $ 346,809 | $ 316,592 | $ 294,653 | $ 236,444

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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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