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INVESTMENTS - Summary of Amortized Cost and Fair Values of Fixed Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Available for sale |  |  |  |
Amortized cost | $ 12,176,473 | $ 12,241,782 |  |
Allowance for expected credit losses | (11,733) | (313) | $ (323) | $ 0
Gross unrealized gains | 18,742 | 165,977 |  |
Gross unrealized losses | (856,588) | (94,246) |  |
Fair value | 11,326,894 | 12,313,200 |  |
U.S. government and agency |  |  |  |
Available for sale |  |  |  |
Amortized cost | 2,731,733 | 2,693,319 |  |
Allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains | 5,386 | 9,776 |  |
Gross unrealized losses | (97,789) | (20,647) |  |
Fair value | 2,639,330 | 2,682,448 |  |
Non-U.S. government |  |  |  |
Available for sale |  |  |  |
Amortized cost | 612,546 | 794,705 |  |
Allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains | 2,395 | 10,158 |  |
Gross unrealized losses | (52,912) | (9,685) |  |
Fair value | 562,029 | 795,178 |  |
Corporate debt |  |  |  |
Available for sale |  |  |  |
Amortized cost | 4,680,798 | 4,446,585 |  |
Allowance for expected credit losses | (11,521) | (236) |  |
Gross unrealized gains | 5,269 | 87,075 |  |
Gross unrealized losses | (418,990) | (38,112) |  |
Fair value | 4,255,556 | 4,495,312 |  |
Agency RMBS |  |  |  |
Available for sale |  |  |  |
Amortized cost | 1,297,423 | 1,065,973 |  |
Allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains | 4,663 | 17,397 |  |
Gross unrealized losses | (99,301) | (8,781) |  |
Fair value | 1,202,785 | 1,074,589 |  |
CMBS |  |  |  |
Available for sale |  |  |  |
Amortized cost | 1,029,863 | 1,223,051 |  |
Allowance for expected credit losses | 0 | 0 |  |
Gross unrealized gains | 60 | 29,827 |  |
Gross unrealized losses | (82,145) | (4,687) |  |
Fair value | 947,778 | 1,248,191 |  |
Non-agency RMBS |  |  |  |
Available for sale |  |  |  |
Amortized cost | 151,907 | 185,854 |  |
Allowance for expected credit losses | (123) | (77) |  |
Gross unrealized gains | 275 | 2,410 |  |
Gross unrealized losses | (18,525) | (2,023) |  |
Fair value | 133,534 | 186,164 |  |
ABS |  |  |  |
Available for sale |  |  |  |
Amortized cost | 1,499,728 | 1,628,739 |  |
Allowance for expected credit losses | (35) | 0 |  |
Gross unrealized gains | 555 | 3,406 |  |
Gross unrealized losses | (70,721) | (9,665) |  |
Fair value | 1,429,527 | 1,622,480 |  |
Municipals |  |  |  |
Available for sale |  |  |  |
Amortized cost | 172,475 | 203,556 |  |
Allowance for expected credit losses | (54) | 0 |  |
Gross unrealized gains | 139 | 5,928 |  |
Gross unrealized losses | (16,205) | (646) |  |
Fair value | $ 156,355 | $ 208,838 |  |

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