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Schedule I - Summary of Investments Other Than Investments in Related Parties Schedule I - Summary of Investments Other Than Investemnts in Related Parties (Details) (USD $)
Dec. 31, 2012
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost $ 313,048,000 [1]
Fair Value 0
Balance Sheet Amount 313,048,000
Fixed Maturities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 8,521,172,000 [1]
Fair Value 9,317,361,000
Balance Sheet Amount 8,775,854,000
Public Utility, Equities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,115,000 [1]
Fair Value 1,626,000
Balance Sheet Amount 1,626,000
Banks, Trust and Insurance, Equities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 252,000 [1]
Fair Value 325,000
Balance Sheet Amount 325,000
Industrial, Miscellaneous, and All Others [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 3,220,000 [1]
Fair Value 4,998,000
Balance Sheet Amount 4,998,000
Nonredeemable Preferred Stock [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 4,873,000 [1]
Fair Value 5,318,000
Balance Sheet Amount 5,318,000
Equity Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 9,460,000 [1]
Fair Value 12,267,000
Balance Sheet Amount 12,267,000
Derivatives, Index Options [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 57,890,000 [1]
Fair Value 0
Balance Sheet Amount 57,890,000
Mortgage Loans on Real Estate [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 142,170,000 [1]
Fair Value 0
Balance Sheet Amount 142,170,000
Policy loans [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 71,549,000 [1]
Fair Value 0
Balance Sheet Amount 71,549,000
Other Long-term Investments [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 41,439,000 [1],[2]
Fair Value 0 [2]
Balance Sheet Amount 41,439,000 [2]
Real estate acquired through foreclosure 900,000
Held-to-maturity Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 5,962,120,000 [1]
Fair Value 6,503,627,000
Balance Sheet Amount 5,962,120,000
Held-to-maturity Securities [Member] | US Government and Government Agencies and Authorities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 25,021,000 [1]
Fair Value 28,417,000
Balance Sheet Amount 25,021,000
Held-to-maturity Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 391,062,000 [1]
Fair Value 431,781,000
Balance Sheet Amount 391,062,000
Held-to-maturity Securities [Member] | Foreign Government Debt [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 9,988,000 [1]
Fair Value 10,604,000
Balance Sheet Amount 9,988,000
Held-to-maturity Securities [Member] | Public Utility, Bonds [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 781,239,000 [1]
Fair Value 870,298,000
Balance Sheet Amount 781,239,000
Held-to-maturity Securities [Member] | Corporate Debt Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 2,887,572,000 [1]
Fair Value 3,157,250,000
Balance Sheet Amount 2,887,572,000
Held-to-maturity Securities [Member] | Collateralized Mortgage Backed Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 1,835,051,000 [1]
Fair Value 1,968,474,000
Balance Sheet Amount 1,835,051,000
Held-to-maturity Securities [Member] | Asset-Backed Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 32,187,000 [1]
Fair Value 36,803,000
Balance Sheet Amount 32,187,000
Available-for-sale Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 2,559,052,000 [1]
Fair Value 2,813,734,000
Balance Sheet Amount 2,813,734,000
Available-for-sale Securities [Member] | US Government and Government Agencies and Authorities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 0 [1]
Fair Value 0
Balance Sheet Amount 0
Available-for-sale Securities [Member] | US States and Political Subdivisions Debt Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 599,000 [1]
Fair Value 571,000
Balance Sheet Amount 571,000
Available-for-sale Securities [Member] | Foreign Government Debt [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 15,134,000 [1]
Fair Value 16,066,000
Balance Sheet Amount 16,066,000
Available-for-sale Securities [Member] | Public Utility, Bonds [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 254,853,000 [1]
Fair Value 281,427,000
Balance Sheet Amount 281,427,000
Available-for-sale Securities [Member] | Corporate Debt Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 2,157,706,000 [1]
Fair Value 2,377,312,000
Balance Sheet Amount 2,377,312,000
Available-for-sale Securities [Member] | Collateralized Mortgage Backed Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 113,488,000 [1]
Fair Value 122,329,000
Balance Sheet Amount 122,329,000
Available-for-sale Securities [Member] | Asset-Backed Securities [Member]
  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Cost 17,272,000 [1]
Fair Value 16,029,000
Balance Sheet Amount $ 16,029,000
[1] Bonds are shown at amortized cost, mortgage loans are shown at unpaid principal balances before allowances for possible losses, derivatives are shown at fair value, and real estate is stated at cost before allowances for possible losses.
[2] Real estate acquired by foreclosure included in other long-term investments is as follows: cost $0.9 million; balance sheet amount $0.9 million.