Fair Value of Financial Instruments - Assets Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | $ 137,282 | $ 103,996 |
Other invested assets—at fair value | 5,079 | 4,165 |
Fair Value, Measurements, Recurring | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 5,590,802 | 6,512,377 |
Derivative assets | 707 | 4,200 |
Total assets at fair value | 5,728,791 | 6,620,573 |
Derivative liabilities | 4,634 | |
Total liabilities at fair value | 4,634 | |
Level I | Fair Value, Measurements, Recurring | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 519,655 | 738,480 |
Derivative assets | 0 | 0 |
Total assets at fair value | 580,021 | 776,482 |
Derivative liabilities | 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 | 5,064,647 | 5,770,897 |
Derivative assets | 56 | 0 |
Total assets at fair value | 5,141,619 | 5,836,891 |
Derivative liabilities | 33 | |
Total liabilities at fair value | 33 | |
Level III | Fair Value, Measurements, Recurring | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 6,500 | 3,000 |
Derivative assets | 651 | 4,200 |
Total assets at fair value | 7,151 | 7,200 |
Derivative liabilities | 4,601 | |
Total liabilities at fair value | 4,601 | |
Loaned securities, fair value | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 76,174 | |
Loaned securities, fair value | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 40,377 | 65,994 |
Loaned securities, fair value | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 9,651 | |
Loaned securities, fair value | Fair Value, Measurements, Recurring | CLO | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 7,117 | |
Loaned securities, fair value | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 2,876 | |
Loaned securities, fair value | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 16,895 | |
Loaned securities, fair value | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 60,366 | 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 and securities sold under repurchase agreements (Note 5) | 0 | 0 |
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | CLO | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level I | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 60,366 | 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 and securities sold under repurchase agreements (Note 5) | 40,377 | 65,994 |
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 9,651 | |
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | CLO | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 7,117 | |
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 2,876 | |
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 16,895 | |
Loaned securities, fair value | Level II | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (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 and securities sold under repurchase agreements (Note 5) | 0 | 0 |
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | CLO | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (Note 5) | 0 | |
Loaned securities, fair value | Level III | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Loaned securities and securities sold under repurchase agreements (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 | 4,909,232 | 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 | 146,664 | 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 | 142,743 | 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 | 2,429,325 | 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 | 900,591 | 705,117 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 599,478 | 709,203 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 490,832 | 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 | 168,087 | 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 | 4,970 | 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 | 26,542 | 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 | 142,882 | 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 | 142,882 | 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 | 4,766,350 | 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 | 3,782 | 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 | 142,743 | 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 | 2,429,325 | 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 | 900,591 | 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 | 599,478 | 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 | 490,832 | 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 | 168,087 | 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 | 4,970 | 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 | 26,542 | 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 | 139,901 | 256,546 |
Trading securities | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 70,475 | 94,637 |
Trading securities | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 47,802 | 119,186 |
Trading securities | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 7,058 | 9,438 |
Trading securities | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 14,566 | 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 | 139,901 | 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 | 70,475 | 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 | 47,802 | 119,186 |
Trading securities | Level II | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 7,058 | 9,438 |
Trading securities | Level II | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 14,566 | 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 | 145,155 | 184,245 |
Equity securities | Level I | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 134,907 | 176,828 |
Equity securities | Level II | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 7,748 | 7,417 |
Equity securities | Level III | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 2,500 | 0 |
Short-term investments | Fair Value, Measurements, Recurring | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 392,514 | 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 | 2,885 | 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 | 53,406 | 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 | Money market instruments | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 241,866 | 274,535 |
Short-term investments | Fair Value, Measurements, Recurring | Other investments | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 94,357 | 101,824 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 241,866 | 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 | Money market instruments | | |
Fair Value by Hierarchy Level [Line Items] | | |
Total investments at fair value | 241,866 | 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 | 150,648 | 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 | 2,885 | 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 | 53,406 | 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 | 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 | 94,357 | 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 | 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 |