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Schedule I Summary of Investments-Other Than Investments in Related Parties (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | $ 8,114,443
Amount Shown in Balance Sheet | 8,250,677
Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 7,373,911
Fair Value | 7,515,318
Amount Shown in Balance Sheet | 7,515,318
Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 111,750
Fair Value | 111,750
Amount Shown in Balance Sheet | 111,750
U.S. Government and federally sponsored agency obligations | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,269,767
Fair Value | 1,283,622
Amount Shown in Balance Sheet | 1,283,622
States, municipalities and political subdivisions | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,884,313
Fair Value | 2,003,969
Amount Shown in Balance Sheet | 2,003,969
Foreign government bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 83,343
Fair Value | 84,904
Amount Shown in Balance Sheet | 84,904
Public utilities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 80,355
Fair Value | 88,296
Amount Shown in Balance Sheet | 88,296
All other corporate bonds | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,956,111
Fair Value | 1,973,314
Amount Shown in Balance Sheet | 1,973,314
Asset-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,320,680
Fair Value | 1,314,352
Amount Shown in Balance Sheet | 1,314,352
Residential mortgage-backed securities (non-agency) | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 85,484
Fair Value | 85,253
Amount Shown in Balance Sheet | 85,253
Commercial mortgage-backed securities | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 676,218
Fair Value | 663,707
Amount Shown in Balance Sheet | 663,707
Redeemable preferred stocks | Fixed maturity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 17,640
Fair Value | 17,901
Amount Shown in Balance Sheet | 17,901
Industrial, miscellaneous and all other | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 25,452
Fair Value | 25,452
Amount Shown in Balance Sheet | 25,452
Banking & finance and insurance companies | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 9,960
Fair Value | 9,960
Amount Shown in Balance Sheet | 9,960
Public utilities | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 1,828
Fair Value | 1,828
Amount Shown in Balance Sheet | 1,828
Non-redeemable preferred stocks | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 54,672
Fair Value | 54,672
Amount Shown in Balance Sheet | 54,672
Closed-end fund | Equity securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 19,838
Fair Value | 19,838
Amount Shown in Balance Sheet | 19,838
Limited partnership interests |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 328,516
Amount Shown in Balance Sheet | 328,516
Short-term Investments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 122,222
Amount Shown in Balance Sheet | 122,222
Policy loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 153,994
Amount Shown in Balance Sheet | 153,994
Derivative instruments |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 7,820
Fair Value | 2,647
Amount Shown in Balance Sheet | 2,647
Mortgage loans |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 2,730
Amount Shown in Balance Sheet | 2,730
Other |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Cost | 13,500
Amount Shown in Balance Sheet | $ 13,500

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