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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Sep. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 1,041 | 519
Fair value, less than 12 months | $ 3,995,493 | $ 2,004,842
Unrealized losses, less than 12 months | $ (443,945) | $ (28,445)
Number of securities, 12 months or greater | security | 245 | 60
Fair value, 12 months or greater | $ 883,682 | $ 166,248
Unrealized losses, 12 months or greater | $ (192,786) | $ (9,593)
Number of securities, total | security | 1,286 | 579
Fair value, total | $ 4,879,175 | $ 2,171,090
Unrealized losses, total | $ (636,731) | $ (38,038)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 16 | 14
Fair value, less than 12 months | $ 94,560 | $ 101,602
Unrealized losses, less than 12 months | $ (22,377) | $ (1,165)
Number of securities, 12 months or greater | security | 8 | 2
Fair value, 12 months or greater | $ 48,322 | $ 6,937
Unrealized losses, 12 months or greater | $ (6,134) | $ (231)
Number of securities, total | security | 24 | 16
Fair value, total | $ 142,882 | $ 108,539
Unrealized losses, total | $ (28,511) | $ (1,396)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 57 | 20
Fair value, less than 12 months | $ 133,696 | $ 32,721
Unrealized losses, less than 12 months | $ (19,265) | $ (401)
Number of securities, 12 months or greater | security | 7 | 0
Fair value, 12 months or greater | $ 8,747 | $ 0
Unrealized losses, 12 months or greater | $ (2,037) | $ 0
Number of securities, total | security | 64 | 20
Fair value, total | $ 142,443 | $ 32,721
Unrealized losses, total | $ (21,302) | $ (401)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 487 | 209
Fair value, less than 12 months | $ 1,992,250 | $ 864,355
Unrealized losses, less than 12 months | $ (266,626) | $ (16,799)
Number of securities, 12 months or greater | security | 123 | 34
Fair value, 12 months or greater | $ 451,971 | $ 99,475
Unrealized losses, 12 months or greater | $ (133,946) | $ (8,087)
Number of securities, total | security | 610 | 243
Fair value, total | $ 2,444,221 | $ 963,830
Unrealized losses, total | $ (400,572) | $ (24,886)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 152 | 57
Fair value, less than 12 months | $ 716,471 | $ 365,476
Unrealized losses, less than 12 months | $ (80,207) | $ (6,749)
Number of securities, 12 months or greater | security | 24 | 3
Fair value, 12 months or greater | $ 130,465 | $ 1,543
Unrealized losses, 12 months or greater | $ (30,177) | $ (28)
Number of securities, total | security | 176 | 60
Fair value, total | $ 846,936 | $ 367,019
Unrealized losses, total | $ (110,384) | $ (6,777)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 129 | 81
Fair value, less than 12 months | $ 517,151 | $ 188,457
Unrealized losses, less than 12 months | $ (35,210) | $ (2,053)
Number of securities, 12 months or greater | security | 39 | 9
Fair value, 12 months or greater | $ 86,743 | $ 22,050
Unrealized losses, 12 months or greater | $ (11,986) | $ (1,015)
Number of securities, total | security | 168 | 90
Fair value, total | $ 603,894 | $ 210,507
Unrealized losses, total | $ (47,196) | $ (3,068)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 121 | 84
Fair value, less than 12 months | $ 359,365 | $ 313,380
Unrealized losses, less than 12 months | $ (14,230) | $ (675)
Number of securities, 12 months or greater | security | 36 | 11
Fair value, 12 months or greater | $ 138,584 | $ 35,612
Unrealized losses, 12 months or greater | $ (6,082) | $ (223)
Number of securities, total | security | 157 | 95
Fair value, total | $ 497,949 | $ 348,992
Unrealized losses, total | $ (20,312) | $ (898)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 76 | 54
Fair value, less than 12 months | $ 133,593 | $ 138,851
Unrealized losses, less than 12 months | $ (3,938) | $ (603)
Number of securities, 12 months or greater | security | 8 | 1
Fair value, 12 months or greater | $ 18,850 | $ 631
Unrealized losses, 12 months or greater | $ (2,424) | $ (9)
Number of securities, total | security | 84 | 55
Fair value, total | $ 152,443 | $ 139,482
Unrealized losses, total | $ (6,362) | $ (612)
Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 2 |
Fair value, less than 12 months | $ 43,437 |
Unrealized losses, less than 12 months | $ (1,947) |
Number of securities, 12 months or greater | security | 0 |
Fair value, 12 months or greater | $ 0 |
Unrealized losses, 12 months or greater | $ 0 |
Number of securities, total | security | 2 |
Fair value, total | $ 43,437 |
Unrealized losses, total | $ (1,947) |
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 1 |
Fair value, less than 12 months | $ 4,970 |
Unrealized losses, less than 12 months | $ (145) |
Number of securities, 12 months or greater | security | 0 |
Fair value, 12 months or greater | $ 0 |
Unrealized losses, 12 months or greater | $ 0 |
Number of securities, total | security | 1 |
Fair value, total | $ 4,970 |
Unrealized losses, total | $ (145) |

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