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Schedule III - Summay of Investments - Other Than Investments in Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Amortized Cost or Cost | $ 4,141,822
Carrying Amount | 4,330,019
Held To Maturity Fixed Maturity Securities Member |
Amortized Cost or Cost | 550,143
Fair Value | 594,661
Carrying Amount | 554,069
Held To Maturity Fixed Maturity Securities Member | Foreign Government Debt [Member] |
Amortized Cost or Cost | 5,292
Fair Value | 5,871
Carrying Amount | 5,504
Held To Maturity Fixed Maturity Securities Member | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 491,180
Fair Value | 526,922
Carrying Amount | 497,949
Held To Maturity Fixed Maturity Securities Member | Public utilities [Member] |
Amortized Cost or Cost | 13,454
Fair Value | 15,098
Carrying Amount | 13,393
Held To Maturity Fixed Maturity Securities Member | Corporate Securities [Member] |
Amortized Cost or Cost | 24,831
Fair Value | 27,023
Carrying Amount | 24,080
Held To Maturity Fixed Maturity Securities Member | Asset-backed Securities [Member] |
Amortized Cost or Cost | 6,980
Fair Value | 7,098
Carrying Amount | 5,928
Held To Maturity Fixed Maturity Securities Member | Commercial Mortgage-backed Securities (CMBS) [Member] |
Amortized Cost or Cost | 8,406
Fair Value | 12,649
Carrying Amount | 7,215
AFS Fixed Maturity Securities [Member] |
Amortized Cost or Cost | 3,130,683
Fair Value | 3,296,013
Carrying Amount | 3,296,013
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member] |
Amortized Cost or Cost | 241,874
Fair Value | 259,092
Carrying Amount | 259,092
AFS Fixed Maturity Securities [Member] | Foreign Government Debt [Member] |
Amortized Cost or Cost | 28,813
Fair Value | 30,229
Carrying Amount | 30,229
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 773,953
Fair Value | 818,024
Carrying Amount | 818,024
AFS Fixed Maturity Securities [Member] | Public utilities [Member] |
Amortized Cost or Cost | 117,573
Fair Value | 124,200
Carrying Amount | 124,200
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member] |
Amortized Cost or Cost | 1,251,381
Fair Value | 1,326,048
Carrying Amount | 1,326,048
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member] |
Amortized Cost or Cost | 126,330
Fair Value | 128,640
Carrying Amount | 128,640
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member] |
Amortized Cost or Cost | 133,763
Fair Value | 137,119
Carrying Amount | 137,119
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities (RMBS) [Member] |
Amortized Cost or Cost | 456,996
Fair Value | 472,661
Carrying Amount | 472,661
Equity Securities [Member] |
Amortized Cost or Cost | 132,441
Fair Value | 151,382
Carrying Amount | 151,382
Equity Securities [Member] | Public Utility, Equities [Member] |
Amortized Cost or Cost | 4,427
Fair Value | 4,554
Carrying Amount | 4,554
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] |
Amortized Cost or Cost | 19,676
Fair Value | 21,868
Carrying Amount | 21,868
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] |
Amortized Cost or Cost | 108,338
Fair Value | 124,960
Carrying Amount | 124,960
Short-term Investments [Member] |
Amortized Cost or Cost | 214,479
Fair Value | 214,479
Carrying Amount | 214,479
Other Investments [Member] |
Amortized Cost or Cost | 114,076
Carrying Amount | $ 114,076

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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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Balance Type: | debit
Period Type: | instant

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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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