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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Jun. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 284 | 858
Fair value, less than 12 months | $ 1,270,977 | $ 3,463,314
Unrealized losses, less than 12 months | $ (41,840) | $ (312,320)
Number of securities, 12 months or greater | security | 919 | 426
Fair value, 12 months or greater | $ 3,491,960 | $ 1,434,379
Unrealized losses, 12 months or greater | $ (502,517) | $ (269,173)
Number of securities, total | security | 1,203 | 1,284
Fair value, total | $ 4,762,937 | $ 4,897,693
Unrealized losses, total | $ (544,357) | $ (581,493)
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 5 | 14
Fair value, less than 12 months | $ 24,477 | $ 86,964
Unrealized losses, less than 12 months | $ (917) | $ (21,370)
Number of securities, 12 months or greater | security | 15 | 10
Fair value, 12 months or greater | $ 105,578 | $ 47,770
Unrealized losses, 12 months or greater | $ (25,506) | $ (7,532)
Number of securities, total | security | 20 | 24
Fair value, total | $ 130,055 | $ 134,734
Unrealized losses, total | $ (26,423) | $ (28,902)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 20 | 43
Fair value, less than 12 months | $ 73,260 | $ 116,285
Unrealized losses, less than 12 months | $ (2,557) | $ (14,231)
Number of securities, 12 months or greater | security | 41 | 20
Fair value, 12 months or greater | $ 68,825 | $ 25,401
Unrealized losses, 12 months or greater | $ (14,318) | $ (7,708)
Number of securities, total | security | 61 | 63
Fair value, total | $ 142,085 | $ 141,686
Unrealized losses, total | $ (16,875) | $ (21,939)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 151 | 411
Fair value, less than 12 months | $ 674,480 | $ 1,769,547
Unrealized losses, less than 12 months | $ (23,598) | $ (176,768)
Number of securities, 12 months or greater | security | 415 | 203
Fair value, 12 months or greater | $ 1,740,198 | $ 701,936
Unrealized losses, 12 months or greater | $ (301,899) | $ (173,769)
Number of securities, total | security | 566 | 614
Fair value, total | $ 2,414,678 | $ 2,471,483
Unrealized losses, total | $ (325,497) | $ (350,537)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 39 | 124
Fair value, less than 12 months | $ 295,011 | $ 610,812
Unrealized losses, less than 12 months | $ (10,636) | $ (46,117)
Number of securities, 12 months or greater | security | 144 | 59
Fair value, 12 months or greater | $ 545,432 | $ 261,370
Unrealized losses, 12 months or greater | $ (84,549) | $ (52,442)
Number of securities, total | security | 183 | 183
Fair value, total | $ 840,443 | $ 872,182
Unrealized losses, total | $ (95,185) | $ (98,559)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 20 | 108
Fair value, less than 12 months | $ 57,961 | $ 469,100
Unrealized losses, less than 12 months | $ (2,617) | $ (38,178)
Number of securities, 12 months or greater | security | 130 | 55
Fair value, 12 months or greater | $ 511,965 | $ 121,277
Unrealized losses, 12 months or greater | $ (56,169) | $ (14,368)
Number of securities, total | security | 150 | 163
Fair value, total | $ 569,926 | $ 590,377
Unrealized losses, total | $ (58,786) | $ (52,546)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 5 | 94
Fair value, less than 12 months | $ 12,461 | $ 246,705
Unrealized losses, less than 12 months | $ (47) | $ (10,271)
Number of securities, 12 months or greater | security | 139 | 61
Fair value, 12 months or greater | $ 461,070 | $ 245,584
Unrealized losses, 12 months or greater | $ (15,815) | $ (10,214)
Number of securities, total | security | 144 | 155
Fair value, total | $ 473,531 | $ 492,289
Unrealized losses, total | $ (15,862) | $ (20,485)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 44 | 61
Fair value, less than 12 months | $ 133,327 | $ 115,181
Unrealized losses, less than 12 months | $ (1,468) | $ (3,603)
Number of securities, 12 months or greater | security | 34 | 18
Fair value, 12 months or greater | $ 53,875 | $ 31,041
Unrealized losses, 12 months or greater | $ (4,155) | $ (3,140)
Number of securities, total | security | 78 | 79
Fair value, total | $ 187,202 | $ 146,222
Unrealized losses, total | $ (5,623) | $ (6,743)
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 |  | $ 43,745
Unrealized losses, less than 12 months |  | $ (1,639)
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 |  | $ 43,745
Unrealized losses, total |  | $ (1,639)
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of securities, less than 12 months | security | 0 | 1
Fair value, less than 12 months | $ 0 | $ 4,975
Unrealized losses, less than 12 months | $ 0 | $ (143)
Number of securities, 12 months or greater | security | 1 | 0
Fair value, 12 months or greater | $ 5,017 | $ 0
Unrealized losses, 12 months or greater | $ (106) | $ 0
Number of securities, total | security | 1 | 1
Fair value, total | $ 5,017 | $ 4,975
Unrealized losses, total | $ (106) | $ (143)

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