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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 1,102 | 519
Fair value, less than 12 months | $ 4,331,570 | $ 2,004,842
Unrealized losses, less than 12 months | $ (330,469) | $ (28,445)
Number of securities, 12 months or greater | security | 141 | 60
Fair value, 12 months or greater | $ 484,275 | $ 166,248
Unrealized losses, 12 months or greater | $ (89,607) | $ (9,593)
Number of securities, total | security | 1,243 | 579
Fair value, total | $ 4,815,845 | $ 2,171,090
Unrealized losses, total | $ (420,076) | $ (38,038)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 19 | 14
Fair value, less than 12 months | $ 122,570 | $ 101,602
Unrealized losses, less than 12 months | $ (17,028) | $ (1,165)
Number of securities, 12 months or greater | security | 5 | 2
Fair value, 12 months or greater | $ 20,027 | $ 6,937
Unrealized losses, 12 months or greater | $ (1,322) | $ (231)
Number of securities, total | security | 24 | 16
Fair value, total | $ 142,597 | $ 108,539
Unrealized losses, total | $ (18,350) | $ (1,396)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 51 | 20
Fair value, less than 12 months | $ 103,028 | $ 32,721
Unrealized losses, less than 12 months | $ (12,050) | $ (401)
Number of securities, 12 months or greater | security | 0 | 0
Fair value, 12 months or greater | $ 0 | $ 0
Unrealized losses, 12 months or greater | $ 0 | $ 0
Number of securities, total | security | 51 | 20
Fair value, total | $ 103,028 | $ 32,721
Unrealized losses, total | $ (12,050) | $ (401)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 532 | 209
Fair value, less than 12 months | $ 2,308,451 | $ 864,355
Unrealized losses, less than 12 months | $ (214,471) | $ (16,799)
Number of securities, 12 months or greater | security | 71 | 34
Fair value, 12 months or greater | $ 198,415 | $ 99,475
Unrealized losses, 12 months or greater | $ (57,265) | $ (8,087)
Number of securities, total | security | 603 | 243
Fair value, total | $ 2,506,866 | $ 963,830
Unrealized losses, total | $ (271,736) | $ (24,886)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 142 | 57
Fair value, less than 12 months | $ 607,722 | $ 365,476
Unrealized losses, less than 12 months | $ (43,891) | $ (6,749)
Number of securities, 12 months or greater | security | 22 | 3
Fair value, 12 months or greater | $ 128,182 | $ 1,543
Unrealized losses, 12 months or greater | $ (20,026) | $ (28)
Number of securities, total | security | 164 | 60
Fair value, total | $ 735,904 | $ 367,019
Unrealized losses, total | $ (63,917) | $ (6,777)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 144 | 81
Fair value, less than 12 months | $ 558,045 | $ 188,457
Unrealized losses, less than 12 months | $ (24,441) | $ (2,053)
Number of securities, 12 months or greater | security | 17 | 9
Fair value, 12 months or greater | $ 43,123 | $ 22,050
Unrealized losses, 12 months or greater | $ (6,566) | $ (1,015)
Number of securities, total | security | 161 | 90
Fair value, total | $ 601,168 | $ 210,507
Unrealized losses, total | $ (31,007) | $ (3,068)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 136 | 84
Fair value, less than 12 months | $ 413,093 | $ 313,380
Unrealized losses, less than 12 months | $ (13,506) | $ (675)
Number of securities, 12 months or greater | security | 22 | 11
Fair value, 12 months or greater | $ 89,722 | $ 35,612
Unrealized losses, 12 months or greater | $ (4,159) | $ (223)
Number of securities, total | security | 158 | 95
Fair value, total | $ 502,815 | $ 348,992
Unrealized losses, total | $ (17,665) | $ (898)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 74 | 54
Fair value, less than 12 months | $ 161,012 | $ 138,851
Unrealized losses, less than 12 months | $ (3,933) | $ (603)
Number of securities, 12 months or greater | security | 4 | 1
Fair value, 12 months or greater | $ 4,806 | $ 631
Unrealized losses, 12 months or greater | $ (269) | $ (9)
Number of securities, total | security | 78 | 55
Fair value, total | $ 165,818 | $ 139,482
Unrealized losses, total | $ (4,202) | $ (612)
Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 3 |
Fair value, less than 12 months | $ 52,600 |
Unrealized losses, less than 12 months | $ (1,085) |
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 | 3 |
Fair value, total | $ 52,600 |
Unrealized losses, total | $ (1,085) |
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 | $ 5,049 |
Unrealized losses, less than 12 months | $ (64) |
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 | $ 5,049 |
Unrealized losses, total | $ (64) |

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