Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | $ 148,098 | $ 203,693 |
Other invested assets—at fair value | 7,422 | 8,625 |
Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 6,586,355 | 6,084,225 |
Derivative assets | 4,688 | 1,913 |
Mortgage servicing rights | 1,561 | |
Total assets at fair value | 6,740,702 | 6,289,831 |
Derivative Liabilities | 1,348 | 1,509 |
Total liabilities at fair value | 1,348 | 1,509 |
Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 709,592 | 574,337 |
Derivative assets | 0 | 0 |
Mortgage servicing rights | 0 | |
Total assets at fair value | 752,819 | 660,038 |
Derivative Liabilities | 0 | 0 |
Total liabilities at fair value | 0 | 0 |
Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,864,589 | 5,500,192 |
Derivative assets | 4,688 | 1,912 |
Mortgage servicing rights | 0 | |
Total assets at fair value | 5,974,148 | 5,620,096 |
Derivative Liabilities | 0 | 817 |
Total liabilities at fair value | 0 | 817 |
Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 12,174 | 9,696 |
Derivative assets | 0 | 1 |
Mortgage servicing rights | 1,561 | |
Total assets at fair value | 13,735 | 9,697 |
Derivative Liabilities | 1,348 | 692 |
Total liabilities at fair value | 1,348 | 692 |
Loaned securities | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 23,366 | 9,803 |
Loaned securities | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 12 | |
Loaned securities | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 104,859 | 117,992 |
Loaned securities | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 19,861 | 75,898 |
Loaned securities | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 23,366 | 9,803 |
Loaned securities | Level I | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | |
Loaned securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Loaned securities | Level I | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 19,861 | 75,898 |
Loaned securities | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Loaned securities | Level II | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 12 | |
Loaned securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 104,859 | 117,992 |
Loaned securities | Level II | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Loaned securities | Level III | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Loaned securities | Level III | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | |
Loaned securities | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Loaned securities | Level III | Fair Value, Measurements, Recurring | Equity securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Less: loaned securities | 0 | 0 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,176,521 | 5,188,228 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 134,694 | 134,593 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 152,959 | 142,785 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 2,409,183 | 2,511,905 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 1,060,805 | 1,014,071 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 495,615 | 558,383 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | CLO | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 515,339 | 487,849 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 360,171 | 284,559 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Foreign government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 5,087 |
Fixed-maturities available for sale | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 47,755 | 48,996 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 125,468 | 124,734 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 125,468 | 124,734 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | CLO | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 0 |
Fixed-maturities available for sale | Level I | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,051,053 | 5,063,494 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 9,226 | 9,859 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 152,959 | 142,785 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 2,409,183 | 2,511,905 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 1,060,805 | 1,014,071 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 495,615 | 558,383 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | CLO | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 515,339 | 487,849 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 360,171 | 284,559 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Foreign government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 5,087 |
Fixed-maturities available for sale | Level II | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 47,755 | 48,996 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | CLO | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 0 |
Fixed-maturities available for sale | Level III | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 91,928 | 106,423 |
Trading securities | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 57,728 | 70,844 |
Trading securities | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 24,129 | 24,913 |
Trading securities | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,440 | 5,930 |
Trading securities | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 4,631 | 4,736 |
Trading securities | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level I | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 91,928 | 106,423 |
Trading securities | Level II | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 57,728 | 70,844 |
Trading securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 24,129 | 24,913 |
Trading securities | Level II | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,440 | 5,930 |
Trading securities | Level II | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 4,631 | 4,736 |
Trading securities | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | RMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Trading securities | Level III | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Equity securities | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 143,314 | 89,057 |
Equity securities | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 132,827 | 81,170 |
Equity securities | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 3,941 | 5,387 |
Equity securities | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 6,546 | 2,500 |
Mortgage loans held for sale | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 458,096 | 32,755 |
Mortgage loans held for sale | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Mortgage loans held for sale | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 458,096 | 32,755 |
Mortgage loans held for sale | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Other investments | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,628 | 7,196 |
Other investments | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Other investments | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Other investments | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 5,628 | 7,196 |
Short-term investments | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 710,868 | 660,566 |
Short-term investments | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 174,339 | |
Short-term investments | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 3,599 | 2,700 |
Short-term investments | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 95,210 | 150,930 |
Short-term investments | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 1,347 |
Short-term investments | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 12,161 | 1,158 |
Short-term investments | Fair Value, Measurements, Recurring | Other investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 148,601 | 135,998 |
Short-term investments | Fair Value, Measurements, Recurring | Money market instruments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 276,958 | 368,433 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 451,297 | 368,433 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 174,339 | |
Short-term investments | Level I | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Other investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level I | Fair Value, Measurements, Recurring | Money market instruments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 276,958 | 368,433 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 259,571 | 292,133 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | |
Short-term investments | Level II | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 3,599 | 2,700 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 95,210 | 150,930 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 1,347 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 12,161 | 1,158 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Other investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 148,601 | 135,998 |
Short-term investments | Level II | Fair Value, Measurements, Recurring | Money market instruments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | |
Short-term investments | Level III | Fair Value, Measurements, Recurring | State and municipal obligations | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Corporate bonds and notes | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | CMBS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other ABS | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Other investments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Short-term investments | Level III | Fair Value, Measurements, Recurring | Money market instruments | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Total investments at fair value | 0 | 0 |
Partnership investments | Carrying Amount | | |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | | |
Other invested assets—at fair value | $ 2,000 | $ 1,000 |