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Investments - Gross Unrealized Losses and Fair Value of Available for Sale Securities (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 933,718 | $ 3,463,314
Unrealized losses, less than 12 months | (39,582) | (312,320)
Fair value, 12 months or greater | 3,867,561 | 1,434,379
Unrealized losses, 12 months or greater | (627,775) | (269,173)
Fair value, total | 4,801,279 | 4,897,693
Unrealized losses, total | $ (667,357) | $ (581,493)
Number of securities in unrealized loss position | security | 1,216 | 1,284
U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | $ 18,644 | $ 86,964
Unrealized losses, less than 12 months | (3,052) | (21,370)
Fair value, 12 months or greater | 106,409 | 47,770
Unrealized losses, 12 months or greater | (33,330) | (7,532)
Fair value, total | 125,053 | 134,734
Unrealized losses, total | (36,382) | (28,902)
State and municipal obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 34,225 | 116,285
Unrealized losses, less than 12 months | (2,994) | (14,231)
Fair value, 12 months or greater | 98,445 | 25,401
Unrealized losses, 12 months or greater | (22,099) | (7,708)
Fair value, total | 132,670 | 141,686
Unrealized losses, total | (25,093) | (21,939)
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 439,005 | 1,769,547
Unrealized losses, less than 12 months | (18,372) | (176,768)
Fair value, 12 months or greater | 1,976,424 | 701,936
Unrealized losses, 12 months or greater | (376,394) | (173,769)
Fair value, total | 2,415,429 | 2,471,483
Unrealized losses, total | (394,766) | (350,537)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 201,321 | 610,812
Unrealized losses, less than 12 months | (11,093) | (46,117)
Fair value, 12 months or greater | 628,227 | 261,370
Unrealized losses, 12 months or greater | (124,241) | (52,442)
Fair value, total | 829,548 | 872,182
Unrealized losses, total | (135,334) | (98,559)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 18,900 | 469,100
Unrealized losses, less than 12 months | (272) | (38,178)
Fair value, 12 months or greater | 538,095 | 121,277
Unrealized losses, 12 months or greater | (57,530) | (14,368)
Fair value, total | 556,995 | 590,377
Unrealized losses, total | (57,802) | (52,546)
CLO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 14,841 | 246,705
Unrealized losses, less than 12 months | (19) | (10,271)
Fair value, 12 months or greater | 445,391 | 245,584
Unrealized losses, 12 months or greater | (8,950) | (10,214)
Fair value, total | 460,232 | 492,289
Unrealized losses, total | (8,969) | (20,485)
Other ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 203,657 | 115,181
Unrealized losses, less than 12 months | (3,774) | (3,603)
Fair value, 12 months or greater | 69,537 | 31,041
Unrealized losses, 12 months or greater | (5,139) | (3,140)
Fair value, total | 273,194 | 146,222
Unrealized losses, total | (8,913) | (6,743)
Mortgage insurance-linked notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 3,125 | 43,745
Unrealized losses, less than 12 months | (6) | (1,639)
Fair value, 12 months or greater | 0 | 0
Unrealized losses, 12 months or greater | 0 | 0
Fair value, total | 3,125 | 43,745
Unrealized losses, total | (6) | (1,639)
Foreign government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, less than 12 months | 0 | 4,975
Unrealized losses, less than 12 months | 0 | (143)
Fair value, 12 months or greater | 5,033 | 0
Unrealized losses, 12 months or greater | (92) | 0
Fair value, total | 5,033 | 4,975
Unrealized losses, total | $ (92) | $ (143)

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