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Summary Of Investments Other Than Investments In Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | $ 3,062,861 | $ 3,041,469
Fair value | 3,158,312 | 3,180,095
Amounts in the balance sheet | 3,158,312 | 3,180,095
Fixed Maturity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,523,042 | 2,270,903
Fair value | 2,560,653 | 2,408,354
Amounts in the balance sheet | 2,560,653 | 2,408,354
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 | 15,994 | 13,999
Fair value | 16,096 | 14,204
Amounts in the balance sheet | 16,096 | 14,204
Fixed Maturity Securities [Member] | Municipal Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 2,201,047 | 2,040,537
Fair value | 2,235,323 | 2,165,095
Amounts in the balance sheet | 2,235,323 | 2,165,095
Fixed Maturity Securities [Member] | Mortgage-Backed Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 37,848 | 27,786
Fair value | 40,247 | 30,703
Amounts in the balance sheet | 40,247 | 30,703
Fixed Maturity Securities [Member] | Corporate Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 264,172 | 151,019
Fair value | 264,685 | 155,551
Amounts in the balance sheet | 264,685 | 155,551
Fixed Maturity Securities [Member] | Collateralized Debt Obligations [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 3,981 | 37,562
Fair value | 4,302 | 42,801
Amounts in the balance sheet | 4,302 | 42,801
Equity Securities [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 223,933 | 475,959
Fair value | 281,883 | 477,088
Amounts in the balance sheet | 281,883 | 477,088
Equity Securities [Member] | Non-Redeemable Preferred Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 29,740 | 10,895
Fair value | 29,567 | 11,701
Amounts in the balance sheet | 29,567 | 11,701
Equity Securities [Member] | Partnership Interest in a Private Credit Fund [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 10,000 | 10,000
Fair value | 12,548 | 11,306
Amounts in the balance sheet | 12,548 | 11,306
Equity Securities [Member] | Public Utilities [Member] | Common Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 81,128 | 82,474
Fair value | 85,287 | 85,106
Amounts in the balance sheet | 85,287 | 85,106
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 | 1,610 | 19,701
Fair value | 2,927 | 22,166
Amounts in the balance sheet | 2,927 | 22,166
Equity Securities [Member] | Energy and Other [Member] | Common Stock [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 101,455 | 352,889
Fair value | 151,554 | 346,809
Amounts in the balance sheet | 151,554 | 346,809
Short-Term Investments [Member] |  |
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items] |  |
Cost | 315,886 | 294,607
Fair value | 315,776 | 294,653
Amounts in the balance sheet | $ 315,776 | $ 294,653

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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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