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INVESTMENTS (Tables) | 3 Months Ended
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Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
AMORTIZED COST AND FAIR VALUES OF FIXED MATURITIES AVAILABLE FOR SALE | The following table provides the amortized cost and fair values of the Company's fixed maturities classified as available for sale:
|  | Amortized cost |  | Allowance for expected credit losses |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  |  |
| At March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
| Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 2,956,074 |  |  | $ | — |  |  | $ | 15,733 |  |  | $ | (70,495) |  |  | $ | 2,901,312 |  |  |  |
| Non-U.S. government | 587,923 |  |  | (28) |  |  | 3,511 |  |  | (33,329) |  |  | 558,077 |  |  |  |
| Corporate debt | 4,619,198 |  |  | (12,436) |  |  | 12,264 |  |  | (321,814) |  |  | 4,297,212 |  |  |  |
| Agency RMBS(1) | 1,344,187 |  |  | — |  |  | 9,111 |  |  | (81,137) |  |  | 1,272,161 |  |  |  |
| CMBS(2) | 996,699 |  |  | — |  |  | 165 |  |  | (73,361) |  |  | 923,503 |  |  |  |
| Non-agency RMBS | 145,288 |  |  | (98) |  |  | 134 |  |  | (15,839) |  |  | 129,485 |  |  |  |
| ABS(3) | 1,454,488 |  |  | (36) |  |  | 828 |  |  | (57,897) |  |  | 1,397,383 |  |  |  |
| Municipals(4) | 160,641 |  |  | (47) |  |  | 317 |  |  | (12,489) |  |  | 148,422 |  |  |  |
| Total fixed maturities, available for sale | $ | 12,264,498 |  |  | $ | (12,645) |  |  | $ | 42,063 |  |  | $ | (666,361) |  |  | $ | 11,627,555 |  |  |  |
| At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
| Available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 2,731,733 |  |  | $ | — |  |  | $ | 5,386 |  |  | $ | (97,789) |  |  | $ | 2,639,330 |  |  |  |
| Non-U.S. government | 612,546 |  |  | — |  |  | 2,395 |  |  | (52,912) |  |  | 562,029 |  |  |  |
| Corporate debt | 4,680,798 |  |  | (11,521) |  |  | 5,269 |  |  | (418,990) |  |  | 4,255,556 |  |  |  |
| Agency RMBS(1) | 1,297,423 |  |  | — |  |  | 4,663 |  |  | (99,301) |  |  | 1,202,785 |  |  |  |
| CMBS(2) | 1,029,863 |  |  | — |  |  | 60 |  |  | (82,145) |  |  | 947,778 |  |  |  |
| Non-agency RMBS | 151,907 |  |  | (123) |  |  | 275 |  |  | (18,525) |  |  | 133,534 |  |  |  |
| ABS(3) | 1,499,728 |  |  | (35) |  |  | 555 |  |  | (70,721) |  |  | 1,429,527 |  |  |  |
| Municipals(4) | 172,475 |  |  | (54) |  |  | 139 |  |  | (16,205) |  |  | 156,355 |  |  |  |
| Total fixed maturities, available for sale | $ | 12,176,473 |  |  | $ | (11,733) |  |  | $ | 18,742 |  |  | $ | (856,588) |  |  | $ | 11,326,894 |  |  |  |
(1)Residential mortgage-backed securities ("RMBS") originated by U.S. government-sponsored agencies. (2)Commercial mortgage-backed securities ("CMBS"). (3)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by auto loans, student loans, credit card receivables and collateralized loan obligations ("CLOs"). (4)Municipals include bonds issued by states, municipalities and political subdivisions.
CONTRACTUAL MATURITIES OF FIXED MATURITIES | The table below provides the contractual maturities of fixed maturities classified as available for sale:
|  | Amortized cost |  | Fair value |  | % of Total fair value |
| At March 31, 2023 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 576,989 |  |  | $ | 563,123 |  |  | 4.9 | % |
| Due after one year through five years | 5,400,687 |  |  | 5,204,250 |  |  | 44.8 | % |
| Due after five years through ten years | 2,171,234 |  |  | 1,974,369 |  |  | 17.0 | % |
| Due after ten years | 174,926 |  |  | 163,281 |  |  | 1.4 | % |
|  | 8,323,836 |  |  | 7,905,023 |  |  | 68.1 | % |
| Agency RMBS | 1,344,187 |  |  | 1,272,161 |  |  | 10.9 | % |
| CMBS | 996,699 |  |  | 923,503 |  |  | 7.9 | % |
| Non-agency RMBS | 145,288 |  |  | 129,485 |  |  | 1.1 | % |
| ABS | 1,454,488 |  |  | 1,397,383 |  |  | 12.0 | % |
| Total | $ | 12,264,498 |  |  | $ | 11,627,555 |  |  | 100.0 | % |
| At December 31, 2022 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 422,039 |  |  | $ | 409,972 |  |  | 3.7 | % |
| Due after one year through five years | 5,349,123 |  |  | 5,078,273 |  |  | 44.8 | % |
| Due after five years through ten years | 2,192,344 |  |  | 1,919,450 |  |  | 16.9 | % |
| Due after ten years | 234,046 |  |  | 205,575 |  |  | 1.8 | % |
|  | 8,197,552 |  |  | 7,613,270 |  |  | 67.2 | % |
| Agency RMBS | 1,297,423 |  |  | 1,202,785 |  |  | 10.6 | % |
| CMBS | 1,029,863 |  |  | 947,778 |  |  | 8.4 | % |
| Non-agency RMBS | 151,907 |  |  | 133,534 |  |  | 1.2 | % |
| ABS | 1,499,728 |  |  | 1,429,527 |  |  | 12.6 | % |
| Total | $ | 12,176,473 |  |  | $ | 11,326,894 |  |  | 100.0 | % |
FIXED MATURITIES AVAILABLE FOR SALE IN AN UNREALIZED LOSS POSITION | The following table summarizes fixed maturities, available for sale in an unrealized loss position and the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
|  | 12 months or greater |  | Less than 12 months |  | Total |
|  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |  | Fair value |  | Unrealized losses |
| At March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 808,593 |  |  | $ | (51,696) |  |  | $ | 738,852 |  |  | $ | (18,799) |  |  | $ | 1,547,445 |  |  | $ | (70,495) |  |
| Non-U.S. government | 263,740 |  |  | (31,114) |  |  | 109,543 |  |  | (2,215) |  |  | 373,283 |  |  | (33,329) |  |
| Corporate debt | 2,499,437 |  |  | (287,339) |  |  | 1,166,503 |  |  | (34,475) |  |  | 3,665,940 |  |  | (321,814) |  |
| Agency RMBS | 533,145 |  |  | (64,620) |  |  | 433,607 |  |  | (16,517) |  |  | 966,752 |  |  | (81,137) |  |
| CMBS | 764,365 |  |  | (66,063) |  |  | 140,843 |  |  | (7,298) |  |  | 905,208 |  |  | (73,361) |  |
| Non-agency RMBS | 99,758 |  |  | (15,383) |  |  | 23,591 |  |  | (456) |  |  | 123,349 |  |  | (15,839) |  |
| ABS | 1,179,697 |  |  | (56,118) |  |  | 134,693 |  |  | (1,779) |  |  | 1,314,390 |  |  | (57,897) |  |
| Municipals | 105,115 |  |  | (11,526) |  |  | 31,816 |  |  | (963) |  |  | 136,931 |  |  | (12,489) |  |
| Total fixed maturities, available for sale | $ | 6,253,850 |  |  | $ | (583,859) |  |  | $ | 2,779,448 |  |  | $ | (82,502) |  |  | $ | 9,033,298 |  |  | $ | (666,361) |  |
| At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities, available for sale |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 467,032 |  |  | $ | (41,365) |  |  | $ | 1,414,181 |  |  | $ | (56,424) |  |  | $ | 1,881,213 |  |  | $ | (97,789) |  |
| Non-U.S. government | 207,637 |  |  | (33,027) |  |  | 298,048 |  |  | (19,885) |  |  | 505,685 |  |  | (52,912) |  |
| Corporate debt | 1,562,355 |  |  | (268,289) |  |  | 2,350,504 |  |  | (150,701) |  |  | 3,912,859 |  |  | (418,990) |  |
| Agency RMBS | 220,595 |  |  | (40,469) |  |  | 771,191 |  |  | (58,832) |  |  | 991,786 |  |  | (99,301) |  |
| CMBS | 343,494 |  |  | (40,888) |  |  | 599,877 |  |  | (41,257) |  |  | 943,371 |  |  | (82,145) |  |
| Non-agency RMBS | 75,137 |  |  | (14,691) |  |  | 53,484 |  |  | (3,834) |  |  | 128,621 |  |  | (18,525) |  |
| ABS | 685,990 |  |  | (48,913) |  |  | 686,190 |  |  | (21,808) |  |  | 1,372,180 |  |  | (70,721) |  |
| Municipals | 52,994 |  |  | (10,120) |  |  | 96,003 |  |  | (6,085) |  |  | 148,997 |  |  | (16,205) |  |
| Total fixed maturities, available for sale | $ | 3,615,234 |  |  | $ | (497,762) |  |  | $ | 6,269,478 |  |  | $ | (358,826) |  |  | $ | 9,884,712 |  |  | $ | (856,588) |  |
FIXED MATURITIES, HELD-TO-MATURITY | The following table provides the amortized cost and fair values of the Company's fixed maturities classified as held to maturity:
|  | Amortized cost |  | Allowance for expected credit losses |  | Net carrying value |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  |  |
| At March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt | $ | 85,200 |  |  | $ | — |  |  | $ | 85,200 |  |  | $ | — |  |  | $ | (9,535) |  |  | $ | 75,665 |  |  |  |
| ABS(1) | 631,568 |  |  | — |  |  | 631,568 |  |  | — |  |  | (10,458) |  |  | 621,110 |  |  |  |
| Total fixed maturities, held to maturity | $ | 716,768 |  |  | $ | — |  |  | $ | 716,768 |  |  | $ | — |  |  | $ | (19,993) |  |  | $ | 696,775 |  |  |  |
| At December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Corporate debt | $ | 85,200 |  |  | $ | — |  |  | $ | 85,200 |  |  | $ | — |  |  | $ | (11,428) |  |  | $ | 73,772 |  |  |  |
| ABS(1) | 613,151 |  |  | — |  |  | 613,151 |  |  | — |  |  | (12,180) |  |  | 600,971 |  |  |  |
| Total fixed maturities, held to maturity | $ | 698,351 |  |  | $ | — |  |  | $ | 698,351 |  |  | $ | — |  |  | $ | (23,608) |  |  | $ | 674,743 |  |  |  |
(1)Asset-backed securities ("ABS") include debt tranched securities collateralized primarily by collateralized loan obligations ("CLOs").
EQUITY SECURITIES | The following table provides the cost and fair values of the Company's equity securities:
|  | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |
| At March 31, 2023 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 3,130 |  |  | $ | 321 |  |  | $ | (437) |  |  | $ | 3,014 |  |
| Preferred stocks | 115 |  |  | — |  |  | (113) |  |  | 2 |  |
| Exchange-traded funds | 199,212 |  |  | 83,523 |  |  | (3,016) |  |  | 279,719 |  |
| Bond mutual funds | 356,836 |  |  | 50 |  |  | (65,705) |  |  | 291,181 |  |
| Total equity securities | $ | 559,293 |  |  | $ | 83,894 |  |  | $ | (69,271) |  |  | $ | 573,916 |  |
| At December 31, 2022 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 7,279 |  |  | $ | 636 |  |  | $ | (442) |  |  | $ | 7,473 |  |
| Preferred stocks | 115 |  |  | — |  |  | (43) |  |  | 72 |  |
| Exchange-traded funds | 207,505 |  |  | 68,058 |  |  | (5,757) |  |  | 269,806 |  |
| Bond mutual funds | 279,457 |  |  | — |  |  | (71,555) |  |  | 207,902 |  |
| Total equity securities | $ | 494,356 |  |  | $ | 68,694 |  |  | $ | (77,797) |  |  | $ | 485,253 |  |
MORTGAGE LOANS NET OF VALUATION ALLOWANCE | The following table provides details of the Company's mortgage loans, held for investment:
|  | March 31, 2023 |  | December 31, 2022 |
|  | Carrying value |  | % of Total |  | Carrying value |  | % of Total |
| Mortgage loans, held for investment: |  |  |  |  |  |  |  |
| Commercial | $ | 636,370 |  |  | 100 | % |  | $ | 627,437 |  |  | 100 | % |
| Allowance for expected credit losses | (1,900) |  |  | — | % |  | — |  |  | — | % |
| Total mortgage loans, held for investment | $ | 634,470 |  |  | 100 | % |  | $ | 627,437 |  |  | 100 | % |
PORTFOLIO OF OTHER INVESTMENTS | The following table provides a summary of the Company's other investments, together with additional information relating to the liquidity of each category:
|  | Fair value |  | % of Total |  | Redemption frequency (if currently eligible) |  | Redemption notice period |
| At March 31, 2023 |  |  |  |  |  |  |  |
| Multi-strategy funds | $ | 30,721 |  |  | 3 | % |  | Quarterly |  | 60-90 days |
| Direct lending funds | 258,183 |  |  | 26 | % |  | Quarterly(1) |  | 90 days |
| Private equity funds | 273,859 |  |  | 27 | % |  | n/a |  | n/a |
| Real estate funds | 300,152 |  |  | 30 | % |  | Quarterly(2), Annually(3) |  | 45-90 days |
| CLO-Equities | 5,019 |  |  | — | % |  | n/a |  | n/a |
| Other privately held investments | 140,953 |  |  | 14 | % |  | n/a |  | n/a |
| Total other investments | $ | 1,008,887 |  |  | 100 | % |  |  |  |  |
| At December 31, 2022 |  |  |  |  |  |  |  |
| Multi-strategy funds | $ | 32,616 |  |  | 3 | % |  | Quarterly |  | 60-90 days |
| Direct lending funds | 258,626 |  |  | 26 | % |  | Quarterly(1) |  | 90 days |
| Private equity funds | 265,836 |  |  | 27 | % |  | n/a |  | n/a |
| Real estate funds | 298,499 |  |  | 30 | % |  | Quarterly(2), Annually(3) |  | 45-90 days |
| CLO-Equities | 5,016 |  |  | — | % |  | n/a |  | n/a |
| Other privately held investments | 136,158 |  |  | 14 | % |  | n/a |  | n/a |
| Total other investments | $ | 996,751 |  |  | 100 | % |  |  |  |  |
n/a - not applicable (1) Applies to one fund with a fair va lue of $35 million (2022: $39 million). (2) Applies to one fund with a fair value of $72 million (2022: $73 million). (3) Applies to one fund with a fair value of $25 million (2022: $27 million).
NET INVESTMENT INCOME | Net investment income was derived from the following sources:
|  | Three months ended March 31, |  |  |  |  |  |
|  | 2023 |  | 2022 |  |  |  |  |  |  |  |  |  |
| Fixed maturities | $ | 118,262 |  |  | $ | 64,809 |  |  |  |  |  |  |  |  |  |  |
| Other investments | 486 |  |  | 26,050 |  |  |  |  |  |  |  |  |  |  |
| Equity securities | 2,455 |  |  | 2,172 |  |  |  |  |  |  |  |  |  |  |
| Mortgage loans | 8,386 |  |  | 4,163 |  |  |  |  |  |  |  |  |  |  |
| Cash and cash equivalents | 10,012 |  |  | 1,118 |  |  |  |  |  |  |  |  |  |  |
| Short-term investments | 1,660 |  |  | 166 |  |  |  |  |  |  |  |  |  |  |
| Gross investment income | 141,261 |  |  | 98,478 |  |  |  |  |  |  |  |  |  |  |
| Investment expenses | (7,490) |  |  | (7,123) |  |  |  |  |  |  |  |  |  |  |
| Net investment income | $ | 133,771 |  |  | $ | 91,355 |  |  |  |  |  |  |  |  |  |  |
NET INVESTMENT GAINS (LOSSES) | The following table provides an analysis of net investment gains (losses):
|  |  | Three months ended March 31, |  |  |  |  |  |
|  |  | 2023 |  | 2022 |  |  |  |  |  |  |  |  |  |
|  | Gross realized investment gains |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fixed maturities and short-term investments | $ | 12,370 |  |  | $ | 10,422 |  |  |  |  |  |  |  |  |  |  |
|  | Equity securities | 1,517 |  |  | — |  |  |  |  |  |  |  |  |  |  |
|  | Gross realized investment gains | 13,887 |  |  | 10,422 |  |  |  |  |  |  |  |  |  |  |
|  | Gross realized investment losses |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Fixed maturities and short-term investments | (53,649) |  |  | (63,146) |  |  |  |  |  |  |  |  |  |  |
|  | Equity securities | (396) |  |  | (225) |  |  |  |  |  |  |  |  |  |  |
|  | Gross realized investment losses | (54,045) |  |  | (63,371) |  |  |  |  |  |  |  |  |  |  |
|  | (Increase) decrease in allowance for expected credit losses, fixed maturities, available for sale | (911) |  |  | (70) |  |  |  |  |  |  |  |  |  |  |
|  | (Increase) decrease in allowance for expected credit losses, mortgage loans | (1,900) |  |  | — |  |  |  |  |  |  |  |  |  |  |
|  | Impairment losses(1) | — |  |  | (109) |  |  |  |  |  |  |  |  |  |  |
|  | Change in fair value of investment derivatives(2) | (947) |  |  | 2,242 |  |  |  |  |  |  |  |  |  |  |
|  | Net unrealized gains (losses) on equity securities | 23,726 |  |  | (43,622) |  |  |  |  |  |  |  |  |  |  |
|  | Net investment losses | $ | (20,190) |  |  | $ | (94,508) |  |  |  |  |  |  |  |  |  |  |
(1) Related to instances where the Company intends to sell securities or it is more likely than not that the Company will be required to sell securities before their anticipated recovery. (2) Refer to Note 5 'Derivative Instruments'.
ALLOWANCE FOR EXPECTED CREDIT LOSSES ON FIXED MATURITIES AVAILABLE FOR SALE | The following table provides a reconciliation of the beginning and ending balances of the allowance for expected credit losses on fixed maturities classified as available for sale:
|  |  | Three months ended March 31, |  |  |  |  |  |
|  |  | 2023 |  | 2022 |  |  |  |  |  |  |  |  |  |
|  | Balance at beginning of period | $ | 11,733 |  |  | $ | 313 |  |  |  |  |  |  |  |  |  |  |
|  | Expected credit losses on securities where credit losses were not previously recognized | 613 |  |  | 9 |  |  |  |  |  |  |  |  |  |  |
|  | Additions (reductions) for expected credit losses on securities where credit losses were previously recognized | 919 |  |  | 78 |  |  |  |  |  |  |  |  |  |  |
|  | Impairments of securities which the Company intends to sell or more likely than not will be required to sell | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
|  | Securities sold/redeemed/matured | (620) |  |  | (17) |  |  |  |  |  |  |  |  |  |  |
|  | Balance at end of period | $ | 12,645 |  |  | $ | 383 |  |  |  |  |  |  |  |  |  |  |

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