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Schedule - Summay of Investments - Other Than Investments in Related Parties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
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