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Fair Value of Financial Instruments - Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | $ 79,073 | $ 103,996
Other invested assets—at fair value | 5,082 | 4,165
Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,905,065 | 6,512,377
Embedded derivatives |  | 4,200
Total assets at fair value | 5,984,138 | 6,620,573
Embedded derivatives | 6,495 |
Total liabilities at fair value | 6,495 |
Level I | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 440,040 | 738,480
Embedded derivatives |  | 0
Total assets at fair value | 503,737 | 776,482
Embedded derivatives | 0 |
Total liabilities at fair value | 0 |
Level II | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,461,025 | 5,770,897
Embedded derivatives |  | 0
Total assets at fair value | 5,476,401 | 5,836,891
Embedded derivatives | 0 |
Total liabilities at fair value | 0 |
Level III | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 4,000 | 3,000
Embedded derivatives |  | 4,200
Total assets at fair value | 4,000 | 7,200
Embedded derivatives | 6,495 |
Total liabilities at fair value | 6,495 |
Loaned securities, fair value | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 15,376 | 65,994
Loaned securities, fair value | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 63,697 | 38,002
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 0 | 0
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 63,697 | 38,002
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 15,376 | 65,994
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 0 | 0
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 0 | 0
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Loaned securities (Note 5) | 0 | 0
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,228,744 | 5,517,078
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 180,504 | 221,730
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 154,980 | 177,257
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 2,757,786 | 2,910,231
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 776,386 | 705,117
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 618,603 | 709,203
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 502,814 | 530,040
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 180,022 | 211,187
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,049 | 5,296
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 52,600 | 47,017
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 153,098 | 192,452
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 153,098 | 192,452
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CLO |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,075,646 | 5,324,626
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 27,406 | 29,278
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 154,980 | 177,257
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 2,757,786 | 2,910,231
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 776,386 | 705,117
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 618,603 | 709,203
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CLO |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 502,814 | 530,040
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 180,022 | 211,187
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 5,049 | 5,296
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 52,600 | 47,017
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CLO |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Foreign government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 189,441 | 256,546
Trading securities | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 80,661 | 94,637
Trading securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 78,289 | 119,186
Trading securities | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 7,941 | 9,438
Trading securities | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 22,550 | 33,285
Trading securities | Level I | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level I | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level I | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level I | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level II | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 189,441 | 256,546
Trading securities | Level II | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 80,661 | 94,637
Trading securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 78,289 | 119,186
Trading securities | Level II | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 7,941 | 9,438
Trading securities | Level II | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 22,550 | 33,285
Trading securities | Level III | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level III | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level III | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Trading securities | Level III | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Equity securities | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 146,574 | 184,245
Equity securities | Level I | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 137,601 | 176,828
Equity securities | Level II | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 8,973 | 7,417
Equity securities | Level III | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 336,306 | 551,508
Short-term investments | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 94,665
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 12,070 | 12,270
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 105,571 | 65,191
Short-term investments | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 3,023
Short-term investments | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 325 |
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 149,341 | 274,535
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 68,999 | 101,824
Short-term investments | Level I | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 149,341 | 369,200
Short-term investments | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 94,665
Short-term investments | Level I | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level I | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 0
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Money market instruments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 149,341 | 274,535
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level II | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 186,965 | 182,308
Short-term investments | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 0
Short-term investments | Level II | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 12,070 | 12,270
Short-term investments | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 105,571 | 65,191
Short-term investments | Level II | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 3,023
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 325 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Money market instruments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 68,999 | 101,824
Short-term investments | Level III | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | State and municipal obligations |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value |  | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Money market instruments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Other investments | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 4,000 | 3,000
Other investments | Level I | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Other investments | Level II | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 0 | 0
Other investments | Level III | Fair Value, Measurements, Recurring |  |
Fair Value by Hierarchy Level [Line Items] |  |
Total investments at fair value | 4,000 | 3,000
Partnership investments | Investments measured at NAV |  |
Fair Value by Hierarchy Level [Line Items] |  |
Other invested assets—at fair value | $ 1,100 | $ 1,200

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