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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | $ 119,837 | $ 203,693
Other invested assets—at fair value | 8,849 | 8,625
Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 6,325,461 | 6,084,225
Derivative assets | 954 | 1,913
Mortgage servicing rights | 345 |
Total assets at fair value | 6,446,597 | 6,289,831
Derivative Liabilities | 1,262 | 1,509
Total liabilities at fair value | 1,262 | 1,509
Level I | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 711,244 | 574,337
Derivative assets | 0 | 0
Mortgage servicing rights | 0 |
Total assets at fair value | 724,844 | 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 | 5,604,521 | 5,500,192
Derivative assets | 954 | 1,912
Mortgage servicing rights | 0 |
Total assets at fair value | 5,711,712 | 5,620,096
Derivative Liabilities | 397 | 817
Total liabilities at fair value | 397 | 817
Level III | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 9,696 | 9,696
Derivative assets | 0 | 1
Mortgage servicing rights | 345 |
Total assets at fair value | 10,041 | 9,697
Derivative Liabilities | 865 | 692
Total liabilities at fair value | 865 | 692
Loaned securities | Fair Value, Measurements, Recurring | U.S. government and agency securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities |  | 9,803
Loaned securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 106,237 | 117,992
Loaned securities | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 13,600 | 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] |  |
Loaned securities |  | 9,803
Loaned securities | Level I | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 0 | 0
Loaned securities | Level I | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 13,600 | 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] |  |
Loaned securities |  | 0
Loaned securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 106,237 | 117,992
Loaned securities | Level II | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
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] |  |
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] |  |
Loaned securities | 0 | 0
Loaned securities | Level III | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
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 | 5,209,025 | 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 | 137,858 | 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 | 156,765 | 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 | 2,503,736 | 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 | 1,049,473 | 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 | 523,580 | 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 | 471,610 | 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 | 318,601 | 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 | 47,402 | 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 | 128,295 | 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 | 128,295 | 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 | 5,080,730 | 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 | 9,563 | 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 | 156,765 | 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 | 2,503,736 | 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 | 1,049,473 | 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 | 523,580 | 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 | 471,610 | 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 | 318,601 | 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 | 47,402 | 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 | 103,256 | 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 | 68,457 | 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 | 24,335 | 24,913
Trading securities | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 5,665 | 5,930
Trading securities | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 4,799 | 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 | 103,256 | 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 | 68,457 | 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 | 24,335 | 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 | 5,665 | 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 | 4,799 | 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 | 155,405 | 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 | 148,297 | 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 | 4,608 | 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 | 2,500 | 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 | 147,034 | 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 | 147,034 | 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 | 7,196 | 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 | 7,196 | 7,196
Short-term investments | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 703,545 | 660,566
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 | 2,600 | 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 | 119,715 | 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 | 9,500 | 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 | 137,078 | 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 | 434,652 | 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 | 434,652 | 368,433
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 | 434,652 | 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 | 268,893 | 292,133
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 | 2,600 | 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 | 119,715 | 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 | 9,500 | 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 | 137,078 | 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 | 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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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