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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value by Hierarchy Level (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | $ 149,541 | $ 112,139
Other invested assets—at fair value | 8,492 | 5,511
Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 5,884,176 | 5,692,276
Derivative assets | 2,563 | 11
Total assets at fair value | 6,036,280 | 5,804,426
Derivative liabilities | 577 | 4,900
Total liabilities at fair value | 577 | 4,900
Level I | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 495,480 | 520,167
Derivative assets | 0 | 0
Total assets at fair value | 566,005 | 584,721
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 | 5,379,180 | 5,165,313
Derivative assets | 2,426 | 11
Total assets at fair value | 5,460,622 | 5,212,909
Derivative liabilities | 15 | 42
Total liabilities at fair value | 15 | 42
Level III | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 9,516 | 6,796
Derivative assets | 137 | 0
Total assets at fair value | 9,653 | 6,796
Derivative liabilities | 562 | 4,858
Total liabilities at fair value | 562 | 4,858
Loaned securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 78,762 |
Loaned securities | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 79,016 | 47,585
Loaned securities | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 0 |
Loaned securities | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 70,525 | 64,554
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 | Mortgage insurance-linked notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 0 |
Loaned securities | Level I | Fair Value, Measurements, Recurring | Equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 70,525 | 64,554
Loaned securities | Level II | Fair Value, Measurements, Recurring | Corporate bonds and notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 79,016 | 47,585
Loaned securities | Level II | Fair Value, Measurements, Recurring | Mortgage insurance-linked notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 0 |
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 | 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 | Mortgage insurance-linked notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Loaned securities | 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 | 5,037,747 | 5,017,711
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 | 135,178 | 145,442
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 | 133,569 | 142,386
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 | 2,379,958 | 2,490,582
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 | 959,210 | 928,399
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 | 560,352 | 593,357
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 | 493,677 | 498,192
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 | 320,088 | 161,359
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 | 5,033 | 4,975
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 | 50,682 | 53,019
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 | 125,053 | 140,011
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 | 125,053 | 140,011
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 | 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 | 4,912,694 | 4,877,700
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 | 10,125 | 5,431
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 | 133,569 | 142,386
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 | 2,379,958 | 2,490,582
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 | 959,210 | 928,399
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 | 560,352 | 593,357
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 | 493,677 | 498,192
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 | 320,088 | 161,359
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 | 5,033 | 4,975
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 | 50,682 | 53,019
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 | 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 | 99,769 | 115,665
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 | 66,554 | 70,511
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 | 22,798 | 32,827
Trading securities | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 5,883 | 6,847
Trading securities | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 4,534 | 5,480
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 | 99,769 | 115,665
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 | 66,554 | 70,511
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 | 22,798 | 32,827
Trading securities | Level II | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 5,883 | 6,847
Trading securities | Level II | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 4,534 | 5,480
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 | 108,911 | 148,965
Equity securities | Level I | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 100,194 | 138,716
Equity securities | Level II | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 6,217 | 7,749
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 | 138,289 | 3,549
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 | 138,289 | 3,549
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 | 7,016 | 4,296
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 | 7,016 | 4,296
Short-term investments | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 492,444 | 402,090
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 | 7,727 |
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 | 2,500 | 2,785
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 | 104,899 | 42,385
Short-term investments | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 1,620 |
Short-term investments | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 1,336 |
Short-term investments | Fair Value, Measurements, Recurring | Other ABS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 7,069 |
Short-term investments | Fair Value, Measurements, Recurring | Other investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 104,787 | 115,480
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 | 262,506 | 241,440
Short-term investments | Level I | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 270,233 | 241,440
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 | 7,727 |
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 | RMBS |  |
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 | 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 |
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 | 262,506 | 241,440
Short-term investments | Level II | Fair Value, Measurements, Recurring |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 222,211 | 160,650
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 | 2,500 | 2,785
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 | 104,899 | 42,385
Short-term investments | Level II | Fair Value, Measurements, Recurring | RMBS |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total investments at fair value | 1,620 |
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 | 1,336 |
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 | 7,069 |
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 | 104,787 | 115,480
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 | RMBS |  |
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 | 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 |
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 | Investments measured at NAV |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Other invested assets—at fair value | $ 1,500 | $ 1,200

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
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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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