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Schedule I (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Other investments, cost | $ 981,554 |
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 940,011 | $ 884,861
Equity Securities | 7,445 | 116,610
Other Long-term Investments | 47,595 | 10,252
Investments | 995,051 | 1,011,723
US Government and Government Agencies and Authorities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 129,417 | 120,260
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 130,425 | 120,816
Foreign Government Debt Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,374 | 3,975
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 1,516 | 4,071
US States and Political Subdivisions Debt Securities [Member] |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 132,336 | 131,203
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 134,382 | 133,751
Public Utility, Bonds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 29,526 | 24,660
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 29,980 | 25,334
Asset-backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 56,351 | 56,487
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 56,657 | 57,129
All Other Corporate Bonds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 285,814 | 281,892
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 292,329 | 288,872
Mortgage Backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 285,639 | 248,206
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 288,212 | 251,903
Other Assets |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 288,212 |
Redeemable Preferred Stock |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,257 | 2,915
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 6,510 | 2,985
Fixed Maturities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 926,714 |
Fixed Maturities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Debt Securities, Available-for-sale, Amortized Cost | 926,714 | 869,598
Fixed maturities, available-for-sale (amortized cost of $926,714 and $869,598, respectively) | 940,011 | 884,861
Mutual Fund |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Equity Securities | 152 |
Cost | 151 |
Fair Value | 152 | 65,453
Public Utility, Equities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Fair Value | 0 | 3,663
Common Stock |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Fair Value | 0 | 44,492
Nonredeemable Preferred Stock |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Equity Securities | 7,293 |
Cost | 7,154 |
Fair Value | 7,293 | 3,002
Equity Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Equity Securities, Amortized Cost Basis | 7,305 |
Equity Securities | 7,445 |
Fair Value | 7,445 | $ 116,610
Other Long-term Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties |  |
Other investments, cost | 47,535 |
Other Long-term Investments | $ 47,595 |

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