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Schedule I Summary of Investments Other Than Investments in Related Parties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Summary of Investments  
Total investments, Cost(1) $ 5,636,399
Total investments, Fair Value   
Total investments, Amount shown in Balance Sheet 6,292,097
Mortgage loans [Member]
  
Summary of Investments  
Total investments, Cost(1) 93
Total investments, Fair Value   
Total investments, Amount shown in Balance Sheet 93
Short-term investments [Member]
  
Summary of Investments  
Total investments, Cost(1) 87,561
Total investments, Fair Value   
Total investments, Amount shown in Balance Sheet 87,561
Policy loans [Member]
  
Summary of Investments  
Total investments, Cost(1) 134,892
Total investments, Fair Value   
Total investments, Amount shown in Balance Sheet 134,892
Other [Member]
  
Summary of Investments  
Total investments, Cost(1) 50,000
Total investments, Fair Value   
Total investments, Amount shown in Balance Sheet 53,816
Fixed maturities [Member]
  
Summary of Investments  
Total investments, Cost(1) 5,311,457
Total investments, Fair Value 5,962,232
Total investments, Amount shown in Balance Sheet 5,962,232
Fixed maturities [Member] | U.S. Government and federally sponsored agency obligations [Member]
  
Summary of Investments  
Total investments, Cost(1) 918,746
Total investments, Fair Value 1,028,987
Total investments, Amount shown in Balance Sheet 1,028,987
Fixed maturities [Member] | States, municipalities and political subdivisions [Member]
  
Summary of Investments  
Total investments, Cost(1) 1,402,424
Total investments, Fair Value 1,586,037
Total investments, Amount shown in Balance Sheet 1,586,037
Fixed maturities [Member] | Foreign government bonds [Member]
  
Summary of Investments  
Total investments, Cost(1) 48,476
Total investments, Fair Value 57,869
Total investments, Amount shown in Balance Sheet 57,869
Fixed maturities [Member] | Public utilities [Member]
  
Summary of Investments  
Total investments, Cost(1) 225,260
Total investments, Fair Value 271,901
Total investments, Amount shown in Balance Sheet 271,901
Fixed maturities [Member] | Other corporate bonds [Member]
  
Summary of Investments  
Total investments, Cost(1) 2,716,551
Total investments, Fair Value 3,017,438
Total investments, Amount shown in Balance Sheet 3,017,438
Equity securities [Member]
  
Summary of Investments  
Total investments, Cost(1) 52,396
Total investments, Fair Value 53,503
Total investments, Amount shown in Balance Sheet 53,503
Equity securities [Member] | Non-redeemable preferred stocks [Member]
  
Summary of Investments  
Total investments, Cost(1) 12,587
Total investments, Fair Value 12,819
Total investments, Amount shown in Balance Sheet 12,819
Equity securities [Member] | Common stocks [Member]
  
Summary of Investments  
Total investments, Cost(1) 39,809
Total investments, Fair Value 40,684
Total investments, Amount shown in Balance Sheet $ 40,684