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Schedule - Summay of Investments - Other Than Investments in Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011
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Amortized Cost or Cost | $ 3,962,809
Carrying Amount | 4,112,421
Held To Maturity Fixed Maturity Securities Member |
Amortized Cost or Cost | 706,782
Fair Value | 758,043
Carrying Amount | 712,348
Held To Maturity Fixed Maturity Securities Member | Foreign Government Debt [Member] |
Amortized Cost or Cost | 5,292
Fair Value | 5,496
Carrying Amount | 5,584
Held To Maturity Fixed Maturity Securities Member | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 614,118
Fair Value | 657,385
Carrying Amount | 626,012
Held To Maturity Fixed Maturity Securities Member | Public utilities [Member] |
Amortized Cost or Cost | 13,800
Fair Value | 15,426
Carrying Amount | 13,725
Held To Maturity Fixed Maturity Securities Member | Corporate Securities [Member] |
Amortized Cost or Cost | 51,040
Fair Value | 54,112
Carrying Amount | 48,926
Held To Maturity Fixed Maturity Securities Member | Asset-backed Securities ("ABS") [Member] |
Amortized Cost or Cost | 8,077
Fair Value | 7,954
Carrying Amount | 6,608
Held To Maturity Fixed Maturity Securities Member | Commercial Mortgage-backed Securities ("CMBS") [Member] |
Amortized Cost or Cost | 14,455
Fair Value | 17,670
Carrying Amount | 11,493
AFS Fixed Maturity Securities [Member] |
Amortized Cost or Cost | 2,766,856
Fair Value | 2,897,373
Carrying Amount | 2,897,373
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member] |
Amortized Cost or Cost | 333,504
Fair Value | 353,796
Carrying Amount | 353,796
AFS Fixed Maturity Securities [Member] | Foreign Government Debt [Member] |
Amortized Cost or Cost | 33,687
Fair Value | 34,173
Carrying Amount | 34,173
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 578,214
Fair Value | 622,659
Carrying Amount | 622,659
AFS Fixed Maturity Securities [Member] | Public utilities [Member] |
Amortized Cost or Cost | 72,145
Fair Value | 75,626
Carrying Amount | 75,626
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member] |
Amortized Cost or Cost | 1,096,294
Fair Value | 1,137,684
Carrying Amount | 1,137,684
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member] |
Amortized Cost or Cost | 77,706
Fair Value | 78,949
Carrying Amount | 78,949
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] |
Amortized Cost or Cost | 107,838
Fair Value | 112,598
Carrying Amount | 112,598
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] |
Amortized Cost or Cost | 467,468
Fair Value | 481,888
Carrying Amount | 481,888
Equity Securities [Member] |
Amortized Cost or Cost | 143,826
Fair Value | 157,355
Carrying Amount | 157,355
Equity Securities [Member] | Public Utility Equities [Member] |
Amortized Cost or Cost | 7,143
Fair Value | 8,307
Carrying Amount | 8,307
Equity Securities [Member] | Banks, Trust and Insurance, Equities [Member] |
Amortized Cost or Cost | 18,405
Fair Value | 19,118
Carrying Amount | 19,118
Equity Securities [Member] | Industrial, Miscellaneous, and All Others [Member] |
Amortized Cost or Cost | 118,278
Fair Value | 129,930
Carrying Amount | 129,930
Short-term Investments [Member] |
Amortized Cost or Cost | 217,044
Carrying Amount | 217,044
Other Investments [Member] |
Amortized Cost or Cost | 128,301
Carrying Amount | $ 128,301

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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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