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Schedule I - Summay of Investments - Other Than Investments in Related Parties (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013
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Amortized Cost or Cost | $ 4,504,075
Carrying Amount | 4,583,312
Held-to-maturity Securities [Member] |
Amortized Cost or Cost | 390,622
Fair Value | 416,981
Carrying Amount | 392,879
Held-to-maturity Securities [Member] | Foreign Government Obligations [Member] |
Amortized Cost or Cost | 5,292
Fair Value | 5,591
Carrying Amount | 5,423
Held-to-maturity Securities [Member] | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 348,109
Fair Value | 369,756
Carrying Amount | 352,122
Held-to-maturity Securities [Member] | Public utilities [Member] |
Amortized Cost or Cost | 12,294
Fair Value | 13,234
Carrying Amount | 12,250
Held-to-maturity Securities [Member] | All Other Corporate Securities [Member] |
Amortized Cost or Cost | 15,880
Fair Value | 17,040
Carrying Amount | 15,578
Held-to-maturity Securities [Member] | Asset-backed Securities [Member] |
Amortized Cost or Cost | 3,413
Fair Value | 3,415
Carrying Amount | 2,758
Held-to-maturity Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member] |
Amortized Cost or Cost | 5,634
Fair Value | 7,945
Carrying Amount | 4,748
AFS Fixed Maturity Securities [Member] |
Amortized Cost or Cost | 3,675,977
Fair Value | 3,715,536
Carrying Amount | 3,715,536
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member] |
Amortized Cost or Cost | 163,218
Fair Value | 173,375
Carrying Amount | 173,375
AFS Fixed Maturity Securities [Member] | Foreign Government Obligations [Member] |
Amortized Cost or Cost | 29,781
Fair Value | 30,615
Carrying Amount | 30,615
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member] |
Amortized Cost or Cost | 946,455
Fair Value | 951,624
Carrying Amount | 951,624
AFS Fixed Maturity Securities [Member] | Public utilities [Member] |
Amortized Cost or Cost | 146,792
Fair Value | 146,453
Carrying Amount | 146,453
AFS Fixed Maturity Securities [Member] | All Other Corporate Securities [Member] |
Amortized Cost or Cost | 1,561,136
Fair Value | 1,588,430
Carrying Amount | 1,588,430
AFS Fixed Maturity Securities [Member] | Asset-backed Securities [Member] |
Amortized Cost or Cost | 140,430
Fair Value | 140,896
Carrying Amount | 140,896
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member] |
Amortized Cost or Cost | 172,288
Fair Value | 171,284
Carrying Amount | 171,284
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities (RMBS) [Member] |
Amortized Cost or Cost | 515,877
Fair Value | 512,859
Carrying Amount | 512,859
Equity Securities [Member] |
Amortized Cost or Cost | 155,350
Fair Value | 192,771
Carrying Amount | 192,771
Equity Securities [Member] | Public Utility, Equities [Member] |
Amortized Cost or Cost | 7,939
Fair Value | 7,934
Carrying Amount | 7,934
Equity Securities [Member] | Banks, Trust and Insurance Companies [Member] |
Amortized Cost or Cost | 26,884
Fair Value | 31,446
Carrying Amount | 31,446
Equity Securities [Member] | Industrial, Miscellaneous, and All Other [Member] |
Amortized Cost or Cost | 120,527
Fair Value | 153,391
Carrying Amount | 153,391
Short-term Investments [Member] |
Amortized Cost or Cost | 174,251
Fair Value | 174,251
Carrying Amount | 174,251
Other Investments [Member] |
Amortized Cost or Cost | 107,875
Carrying Amount | $ 107,875

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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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