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SCHEDULE I - SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Thousands | Dec. 31, 2023 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | $ 6,077,047
Fair Value | 5,737,884
Amount at which shown in the balance sheet | 5,737,884
Fixed income |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 6,061,022
Fair Value | 5,723,113
Amount at which shown in the balance sheet | 5,723,113
Fixed income | U.S. Treasury securities and obligations of U.S. government corporations and agencies |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 167,995
Fair Value | 161,682
Amount at which shown in the balance sheet | 161,682
Fixed income | Obligations of U.S. states and political subdivisions |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 2,092,754
Fair Value | 1,908,078
Amount at which shown in the balance sheet | 1,908,078
Fixed income | Foreign government debt |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 4,486
Fair Value | 3,843
Amount at which shown in the balance sheet | 3,843
Fixed income | Public utilities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 251,151
Fair Value | 250,952
Amount at which shown in the balance sheet | 250,952
Fixed income | ABS |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 173,256
Fair Value | 171,273
Amount at which shown in the balance sheet | 171,273
Fixed income | CLOs |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 327,467
Fair Value | 326,096
Amount at which shown in the balance sheet | 326,096
Fixed income | Mortgage-backed |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 640,336
Fair Value | 608,230
Amount at which shown in the balance sheet | 608,230
Fixed income | All other corporate debt securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 2,375,250
Fair Value | 2,264,629
Amount at which shown in the balance sheet | 2,264,629
Fixed income | Commercial paper |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 28,327
Fair Value | 28,330
Amount at which shown in the balance sheet | 28,330
Equity Securities |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 16,025
Fair Value | 14,771
Amount at which shown in the balance sheet | 14,771
Equity Securities | Industrial, miscellaneous and all other |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |
Amortized Cost | 16,025
Fair Value | 14,771
Amount at which shown in the balance sheet | $ 14,771

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