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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
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