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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
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

X

- 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

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X

- 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

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X

- 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

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