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INVESTMENTS - Fixed Maturities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Available for sale |  |  |  |  |  |
Amortized cost | $ 13,806,792 |  | $ 12,634,254 |  |  |
Allowance for expected credit losses | (4,422) | $ (4,631) | (10,759) | $ (8,933) | $ (10,551) | $ (11,733)
Gross unrealized gains | 221,751 |  | 91,762 |  |  |
Gross unrealized losses | (255,928) |  | (480,515) |  |  |
Fair value | 13,768,193 |  | 12,234,742 |  |  |
U.S. government and agency |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 2,793,879 |  | 3,049,445 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 37,888 |  | 13,211 |  |  |
Gross unrealized losses | (20,967) |  | (55,128) |  |  |
Fair value | 2,810,800 |  | 3,007,528 |  |  |
Non-U.S. government |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 798,756 |  | 729,761 |  |  |
Allowance for expected credit losses | (17) |  | (30) |  |  |
Gross unrealized gains | 25,806 |  | 13,089 |  |  |
Gross unrealized losses | (7,914) |  | (18,861) |  |  |
Fair value | 816,631 |  | 723,959 |  |  |
Corporate debt |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 5,740,096 |  | 4,651,654 |  |  |
Allowance for expected credit losses | (4,164) |  | (10,438) |  |  |
Gross unrealized gains | 111,523 |  | 49,434 |  |  |
Gross unrealized losses | (124,069) |  | (216,478) |  |  |
Fair value | 5,723,386 |  | 4,474,172 |  |  |
Agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 1,764,991 |  | 1,706,204 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 29,026 |  | 11,495 |  |  |
Gross unrealized losses | (46,954) |  | (83,038) |  |  |
Fair value | 1,747,063 |  | 1,634,661 |  |  |
CMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 839,795 |  | 897,553 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 3,553 |  | 551 |  |  |
Gross unrealized losses | (32,591) |  | (58,408) |  |  |
Fair value | 810,757 |  | 839,696 |  |  |
Non-agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 132,009 |  | 165,910 |  |  |
Allowance for expected credit losses | (190) |  | (194) |  |  |
Gross unrealized gains | 1,128 |  | 713 |  |  |
Gross unrealized losses | (8,502) |  | (13,033) |  |  |
Fair value | 124,445 |  | 153,396 |  |  |
ABS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 1,582,069 |  | 1,265,187 |  |  |
Allowance for expected credit losses | (51) |  | (50) |  |  |
Gross unrealized gains | 11,689 |  | 2,855 |  |  |
Gross unrealized losses | (8,605) |  | (25,021) |  |  |
Fair value | 1,585,102 |  | 1,242,971 |  |  |
Municipals |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Amortized cost | 155,197 |  | 168,540 |  |  |
Allowance for expected credit losses | 0 |  | (47) |  |  |
Gross unrealized gains | 1,138 |  | 414 |  |  |
Gross unrealized losses | (6,326) |  | (10,548) |  |  |
Fair value | $ 150,009 |  | $ 158,359 |  |  |

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