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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | $ 134,393 |  | $ 139,121 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,849,082 | [1] | 5,699,797 | [2]
Total assets at fair value | 5,983,475 | [1] | 5,838,918 | [2]
Derivative Liabilities | $ 1,623 |  | $ 1,249 |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities |  | Other Liabilities |
Total liabilities at fair value | $ 1,623 |  | $ 1,249 |
Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 488,845 | [1] | 549,890 | [2]
Total assets at fair value | 527,031 | [1] | 558,695 | [2]
Derivative Liabilities | 0 |  | 0 |
Total liabilities at fair value | 0 |  | 0 |
Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,347,813 | [1] | 5,137,453 | [2]
Total assets at fair value | 5,444,020 | [1] | 5,267,769 | [2]
Derivative Liabilities | 0 |  | 0 |
Total liabilities at fair value | 0 |  | 0 |
Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 12,424 | [1] | 12,454 | [2]
Total assets at fair value | 12,424 | [1] | 12,454 | [2]
Derivative Liabilities | 1,623 |  | 1,249 |
Total liabilities at fair value | 1,623 |  | 1,249 |
Loaned securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 32,824 |  | 130,256 | [3]
Loaned securities | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 2,431 |  | 60 | [3]
Loaned securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 |  | 0 | [3]
Loaned securities | Level I | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 |  | 0 | [3]
Loaned securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 32,824 |  | 130,256 | [3]
Loaned securities | Level II | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 2,431 |  | 60 | [3]
Loaned securities | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 |  | 0 | [3]
Loaned securities | Level III | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 |  | 0 | [3]
Fixed-maturities available for sale | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,074,425 |  | 5,062,405 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 122,201 |  | 120,240 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 172,646 |  | 147,891 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 2,489,211 |  | 2,473,994 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 968,792 |  | 1,011,619 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 281,048 |  | 411,276 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 440,175 |  | 411,462 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 554,016 |  | 438,767 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 46,336 | [4] | 47,156 | [5]
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 122,201 |  | 113,695 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 122,201 |  | 113,695 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CLO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [4] | 0 | [5]
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 4,952,224 |  | 4,948,710 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 6,545 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 172,646 |  | 147,891 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 2,489,211 |  | 2,473,994 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 968,792 |  | 1,011,619 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 281,048 |  | 411,276 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CLO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 440,175 |  | 411,462 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 554,016 |  | 438,767 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 46,336 | [4] | 47,156 | [5]
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CLO |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [4] | 0 | [5]
Trading securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 74,595 |  | 82,652 |
Trading securities | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 41,817 |  | 50,844 |
Trading securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 24,874 |  | 23,941 |
Trading securities | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 2,632 |  | 3,029 |
Trading securities | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,272 |  | 4,838 |
Trading securities | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 74,595 |  | 82,652 |
Trading securities | Level II | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 41,817 |  | 50,844 |
Trading securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 24,874 |  | 23,941 |
Trading securities | Level II | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 2,632 |  | 3,029 |
Trading securities | Level II | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,272 |  | 4,838 |
Trading securities | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | State and municipal obligations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | RMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | CMBS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Equity securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 75,540 |  | 138,189 |
Equity securities | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 63,170 |  | 128,368 |
Equity securities | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,824 |  | 3,275 |
Equity securities | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 6,546 |  | 6,546 |
Equity securities | Loaned securities | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 38,186 | [6] | 8,805 | [3]
Equity securities | Loaned securities | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 38,186 | [6] | 8,805 | [3]
Equity securities | Loaned securities | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 | [6] | 0 | [3]
Equity securities | Loaned securities | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loaned securities | 0 | [6] | 0 | [3]
Other invested assets | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,878 | [1],[7] | 5,908 | [2],[8]
Other invested assets | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [1],[7] | 0 | [2],[8]
Other invested assets | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [1],[7] | 0 | [2],[8]
Other invested assets | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 5,878 | [1],[7] | 5,908 | [2],[8]
Short-term investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 618,644 |  | 410,643 |
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 96,207 | [6] | 26,738 |
Short-term investments | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value |  |  | 14,761 |
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 279,915 | [9] | 61,317 | [10]
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 303,474 |  | 307,827 |
Short-term investments | Level I | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 303,474 |  | 307,827 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [6] | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value |  |  | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [9] | 0 | [10]
Short-term investments | Level I | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 303,474 |  | 307,827 |
Short-term investments | Level II | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 315,170 |  | 102,816 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 96,207 | [6] | 26,738 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value |  |  | 14,761 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 279,915 | [9] | 61,317 | [10]
Short-term investments | Level II | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [6] | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value |  |  | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 | [9] | 0 | [10]
Short-term investments | Level III | Fair Value, Measurements, Recurring | Money market instruments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total investments at fair value | 0 |  | 0 |
Partnership investments | Carrying Amount |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other invested assets—at fair value | $ 3,000 |  | $ 2,000 |
[1] | Does not include other invested assets of $3 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient.
[2] | Does not include other invested assets of $2 million that are primarily invested in limited partnership investments valued using the net asset value as a practical expedient.
[3] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets on our condensed consolidated balance sheets. See Note 7 for more information on our securities lending agreements.
[4] | Includes mortgage insurance-linked notes purchased by Radian Group in connection with the XOL Program. See Note 8 for more information.
[5] | Includes mortgage insurance-linked notes purchased by Radian Group in connection with the XOL Program. See Note 8 for more information.
[6] | Securities loaned to third-party borrowers under securities lending agreements are classified as other assets on our condensed consolidated balance sheets. See Note 7 for more information on our securities lending agreements.
[7] | Consists primarily of interests in private debt and equity investments.
[8] | Consists primarily of interests in private debt and equity investments.
[9] | Comprises short-term certificates of deposit and commercial paper.
[10] | Comprises short-term certificates of deposit and commercial paper.

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