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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
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