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INVESTMENTS (Fixed Maturities Available For Sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 12,202,767 |  | $ 11,566,930 |  |  |
Allowance for expected credit losses | (399) | $ (84) | (323) | $ (2,498) | $ (6,257) | $ 0
Gross unrealized gains | 234,472 |  | 494,103 |  |  |
Gross unrealized losses | (55,881) |  | (18,911) |  |  |
Fair value | 12,380,959 |  | 12,041,799 |  |  |
U.S. government and agency |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 2,688,431 |  | 1,881,489 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 14,768 |  | 38,969 |  |  |
Gross unrealized losses | (10,805) |  | (1,759) |  |  |
Fair value | 2,692,394 |  | 1,918,699 |  |  |
Non-U.S. government |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 714,081 |  | 632,875 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 13,696 |  | 38,826 |  |  |
Gross unrealized losses | (7,855) |  | (428) |  |  |
Fair value | 719,922 |  | 671,273 |  |  |
Corporate debt |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 4,450,477 |  | 4,408,351 |  |  |
Allowance for expected credit losses | (324) |  | (303) |  |  |
Gross unrealized gains | 121,913 |  | 254,261 |  |  |
Gross unrealized losses | (24,416) |  | (6,358) |  |  |
Fair value | 4,547,650 |  | 4,655,951 |  |  |
Agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,144,205 |  | 1,244,727 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 24,213 |  | 42,170 |  |  |
Gross unrealized losses | (5,380) |  | (688) |  |  |
Fair value | 1,163,038 |  | 1,286,209 |  |  |
CMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,185,705 |  | 1,268,273 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 42,927 |  | 87,598 |  |  |
Gross unrealized losses | (2,407) |  | (2,284) |  |  |
Fair value | 1,226,225 |  | 1,353,587 |  |  |
Non-agency RMBS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 192,129 |  | 136,198 |  |  |
Allowance for expected credit losses | (75) |  | (20) |  |  |
Gross unrealized gains | 2,818 |  | 4,604 |  |  |
Gross unrealized losses | (1,108) |  | (678) |  |  |
Fair value | 193,764 |  | 140,104 |  |  |
ABS |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 1,640,602 |  | 1,712,236 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 6,311 |  | 14,527 |  |  |
Gross unrealized losses | (3,668) |  | (6,685) |  |  |
Fair value | 1,643,245 |  | 1,720,078 |  |  |
Municipals |  |  |  |  |  |
Available for sale |  |  |  |  |  |
Fixed maturities, available for sale, amortized cost | 187,137 |  | 282,781 |  |  |
Allowance for expected credit losses | 0 |  | 0 |  |  |
Gross unrealized gains | 7,826 |  | 13,148 |  |  |
Gross unrealized losses | (242) |  | (31) |  |  |
Fair value | $ 194,721 |  | $ 295,898 |  |  |

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