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INVESTMENTS - Fixed Maturities Available For Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 12,086,129 |  | $ 12,241,782 |  |  |
Allowance for expected credit losses | (7,294) | $ (383) | (313) | $ (84) | $ (234) | $ (323)
Gross unrealized gains | 5,517 |  | 165,977 |  |  |
Gross unrealized losses | (779,670) |  | (94,246) |  |  |
Fair value | 11,304,682 |  | 12,313,200 |  |  |
U.S. government and agency |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,529,109 |  | 2,693,319 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 974 |  | 9,776 |  |  |
Gross unrealized losses | (91,774) |  | (20,647) |  |  |
Fair value | 2,438,309 |  | 2,682,448 |  |  |
Non-U.S. government |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 705,258 |  | 794,705 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 172 |  | 10,158 |  |  |
Gross unrealized losses | (50,710) |  | (9,685) |  |  |
Fair value | 654,720 |  | 795,178 |  |  |
Corporate debt |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 4,764,585 |  | 4,446,585 |  |  |
Allowance for expected credit losses | (7,180) |  | (236) |  |  |
Gross unrealized gains | 2,415 |  | 87,075 |  |  |
Gross unrealized losses | (418,763) |  | (38,112) |  |  |
Fair value | 4,341,057 |  | 4,495,312 |  |  |
Agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,082,381 |  | 1,065,973 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 1,112 |  | 17,397 |  |  |
Gross unrealized losses | (64,369) |  | (8,781) |  |  |
Fair value | 1,019,124 |  | 1,074,589 |  |  |
CMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,143,767 |  | 1,223,051 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 45 |  | 29,827 |  |  |
Gross unrealized losses | (60,772) |  | (4,687) |  |  |
Fair value | 1,083,040 |  | 1,248,191 |  |  |
Non-agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 162,101 |  | 185,854 |  |  |
Allowance for expected credit losses | (86) |  | (77) |  |  |
Gross unrealized gains | 431 |  | 2,410 |  |  |
Gross unrealized losses | (14,342) |  | (2,023) |  |  |
Fair value | 148,104 |  | 186,164 |  |  |
ABS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,524,417 |  | 1,628,739 |  |  |
Allowance for expected credit losses | (28) |  | 0 |  |  |
Gross unrealized gains | 339 |  | 3,406 |  |  |
Gross unrealized losses | (68,578) |  | (9,665) |  |  |
Fair value | 1,456,150 |  | 1,622,480 |  |  |
Municipals |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 174,511 |  | 203,556 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 29 |  | 5,928 |  |  |
Gross unrealized losses | (10,362) |  | (646) |  |  |
Fair value | $ 164,178 |  | $ 208,838 |  |  |

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