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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

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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