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Schedule I: Summary of Investments—Other Than Investments in Related Parties (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | $ 6,407,842 |
Fair Value | 5,805,630 |
Amount Reflected on the Consolidated Balance Sheet | 5,805,630 |
Loaned securities | 112,139 | $ 103,996
Reinvested cash collateral held under securities lending agreements | 99,735 | $ 48,652
U.S. government and agency securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 174,138 |
Fair Value | 145,442 |
Amount Reflected on the Consolidated Balance Sheet | 145,442 |
State and municipal obligations |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 164,325 |
Fair Value | 142,386 |
Amount Reflected on the Consolidated Balance Sheet | 142,386 |
Corporate bonds and notes |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 2,886,905 |
Fair Value | 2,537,771 |
Amount Reflected on the Consolidated Balance Sheet | 2,537,771 |
RMBS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 1,025,795 |
Fair Value | 928,399 |
Amount Reflected on the Consolidated Balance Sheet | 928,399 |
CMBS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 645,890 |
Fair Value | 593,357 |
Amount Reflected on the Consolidated Balance Sheet | 593,357 |
CLO |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 518,677 |
Fair Value | 498,192 |
Amount Reflected on the Consolidated Balance Sheet | 498,192 |
Other ABS |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 168,033 |
Fair Value | 161,359 |
Amount Reflected on the Consolidated Balance Sheet | 161,359 |
Foreign government and agency securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 5,118 |
Fair Value | 4,975 |
Amount Reflected on the Consolidated Balance Sheet | 4,975 |
Mortgage insurance-linked notes |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 54,578 |
Fair Value | 53,019 |
Amount Reflected on the Consolidated Balance Sheet | 53,019 |
Total fixed-maturities available for sale |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 5,643,459 |
Fair Value | 5,064,900 |
Amount Reflected on the Consolidated Balance Sheet | 5,064,900 |
Total fixed-maturities available for sale | Loaned securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | 47,200 |
Trading securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 122,472 |
Fair Value | 115,665 |
Amount Reflected on the Consolidated Balance Sheet | 115,665 |
Reinvested cash collateral held under securities lending agreements | 99,700 |
Common stocks |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 230,525 |
Fair Value | 213,519 |
Amount Reflected on the Consolidated Balance Sheet | 213,519 |
Total equity securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 230,525 |
Fair Value | 213,519 |
Amount Reflected on the Consolidated Balance Sheet | 213,519 |
Mortgage loans held for sale |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 3,498 |
Fair Value | 3,549 |
Amount Reflected on the Consolidated Balance Sheet | 3,549 |
Other invested assets |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 5,336 |
Fair Value | 5,511 |
Amount Reflected on the Consolidated Balance Sheet | 5,511 |
Short-term investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Amortized Cost | 402,552 |
Fair Value | 402,486 |
Amount Reflected on the Consolidated Balance Sheet | 402,486 |
Short-term investments | Loaned securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | 400 |
Equity securities | Loaned securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Loaned securities | $ 64,600 |

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