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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost $ 7,687,155 [1]
Total investments, Amount shown in Balance Sheet 7,999,372
Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 7,152,127 [1]
Total investments, Fair Value 7,456,708
Total investments, Amount shown in Balance Sheet 7,456,708
Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 134,013 [1]
Total investments, Fair Value 141,649
Total investments, Amount shown in Balance Sheet 141,649
U.S. Government and federally sponsored agency obligations [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 921,477 [1]
Total investments, Fair Value 946,268
Total investments, Amount shown in Balance Sheet 946,268
States, municipalities and political subdivisions [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 1,648,252 [1]
Total investments, Fair Value 1,769,398
Total investments, Amount shown in Balance Sheet 1,769,398
Foreign government bonds [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 93,864 [1]
Total investments, Fair Value 98,669
Total investments, Amount shown in Balance Sheet 98,669
Public utilities [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 140,893 [1]
Total investments, Fair Value 159,328
Total investments, Amount shown in Balance Sheet 159,328
Other bonds [Member] | Fixed Maturities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 4,347,641 [1]
Total investments, Fair Value 4,483,045
Total investments, Amount shown in Balance Sheet 4,483,045
Non-redeemable Preferred Stock [Member] | Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 52,294 [1]
Total investments, Fair Value 50,048
Total investments, Amount shown in Balance Sheet 50,048
Common Stocks [Member] | Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 61,715 [1]
Total investments, Fair Value 72,233
Total investments, Amount shown in Balance Sheet 72,233
Closed-end fund [Member] | Equity Securities [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 20,004 [1]
Total investments, Fair Value 19,368
Total investments, Amount shown in Balance Sheet 19,368
Short-term Investments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 44,918 [1]
Total investments, Amount shown in Balance Sheet 44,918
Policy Loans [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 151,908 [1]
Total investments, Amount shown in Balance Sheet 151,908
Mortgages loan [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 57 [1]
Total investments, Amount shown in Balance Sheet 57
Derivative instruments [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 8,694 [1]
Total investments, Amount shown in Balance Sheet 8,694
Other [Member]  
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]  
Total investments, Cost 195,438 [1]
Total investments, Amount shown in Balance Sheet $ 195,438
[1] Bonds at original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts and impairment in value of specifically identified investments.