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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
AMORTIZED COST/COST AND FAIR VALUES OF FIXED MATURITIES AND EQUITIES | The amortized cost and fair values of the Company's fixed maturities classified as available for sale were as follows:
|  | Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |  | Non-credit OTTI in AOCI(5) |
| At September 30, 2019 |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 2,106,902 |  |  | $ | 30,012 |  |  | $ | (2,958 | ) |  | $ | 2,133,956 |  |  | $ | — |  |
| Non-U.S. government | 543,426 |  |  | 6,214 |  |  | (12,008 | ) |  | 537,632 |  |  | — |  |
| Corporate debt | 4,966,942 |  |  | 133,081 |  |  | (22,928 | ) |  | 5,077,095 |  |  | — |  |
| Agency RMBS(1) | 1,609,193 |  |  | 26,811 |  |  | (3,236 | ) |  | 1,632,768 |  |  | — |  |
| CMBS(2) | 1,321,029 |  |  | 48,726 |  |  | (865 | ) |  | 1,368,890 |  |  | — |  |
| Non-Agency RMBS | 59,308 |  |  | 1,230 |  |  | (1,586 | ) |  | 58,952 |  |  | (662 | ) |
| ABS(3) | 1,600,758 |  |  | 5,974 |  |  | (6,197 | ) |  | 1,600,535 |  |  | — |  |
| Municipals(4) | 200,146 |  |  | 6,444 |  |  | (177 | ) |  | 206,413 |  |  | — |  |
| Total fixed maturities | $ | 12,407,704 |  |  | $ | 258,492 |  |  | $ | (49,955 | ) |  | $ | 12,616,241 |  |  | $ | (662 | ) |
| At December 31, 2018 |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 1,520,142 |  |  | $ | 4,232 |  |  | $ | (8,677 | ) |  | $ | 1,515,697 |  |  | $ | — |  |
| Non-U.S. government | 507,550 |  |  | 1,586 |  |  | (16,120 | ) |  | 493,016 |  |  | — |  |
| Corporate debt | 4,990,279 |  |  | 15,086 |  |  | (128,444 | ) |  | 4,876,921 |  |  | — |  |
| Agency RMBS(1) | 1,666,684 |  |  | 6,508 |  |  | (29,884 | ) |  | 1,643,308 |  |  | — |  |
| CMBS(2) | 1,103,507 |  |  | 2,818 |  |  | (13,795 | ) |  | 1,092,530 |  |  | — |  |
| Non-Agency RMBS | 40,732 |  |  | 1,237 |  |  | (1,282 | ) |  | 40,687 |  |  | (857 | ) |
| ABS(3) | 1,651,350 |  |  | 1,493 |  |  | (15,240 | ) |  | 1,637,603 |  |  | — |  |
| Municipals(4) | 136,068 |  |  | 914 |  |  | (1,397 | ) |  | 135,585 |  |  | — |  |
| Total fixed maturities | $ | 11,616,312 |  |  | $ | 33,874 |  |  | $ | (214,839 | ) |  | $ | 11,435,347 |  |  | $ | (857 | ) |
(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, collateralized debt obligations ("CDOs") and collateralized loan obligations ("CLOs").
(4) | Municipals include bonds issued by states, municipalities and political subdivisions.
(5) Represents the non-credit component of the other-than-temporary impairment ("OTTI") losses, adjusted for subsequent sales, maturities and redemptions. It does not include the change in fair value subsequent to the impairment measurement date.
EQUITY SECURITIES | The cost and fair values of the Company's equity securities were as follows:
|  | Cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value |
| At September 30, 2019 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 504 |  |  | $ | 67 |  |  | $ | (387 | ) |  | $ | 184 |  |
| Exchange-traded funds | 215,620 |  |  | 61,809 |  |  | (3,707 | ) |  | 273,722 |  |
| Bond mutual funds | 164,521 |  |  | — |  |  | (8,524 | ) |  | 155,997 |  |
| Total equity securities | $ | 380,645 |  |  | $ | 61,876 |  |  | $ | (12,618 | ) |  | $ | 429,903 |  |
| At December 31, 2018 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 790 |  |  | $ | 112 |  |  | $ | (375 | ) |  | $ | 527 |  |
| Exchange-traded funds | 213,420 |  |  | 33,498 |  |  | (10,079 | ) |  | 236,839 |  |
| Bond mutual funds | 151,695 |  |  | — |  |  | (7,428 | ) |  | 144,267 |  |
| Total equity securities | $ | 365,905 |  |  | $ | 33,610 |  |  | $ | (17,882 | ) |  | $ | 381,633 |  |
CONTRACTUAL MATURITIES OF FIXED MATURITIES | Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The contractual maturities of fixed maturities are shown below:
|  | Amortized cost |  | Fair value |  | % of Total fair value |
| At September 30, 2019 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 331,379 |  |  | $ | 330,584 |  |  | 2.6 | % |
| Due after one year through five years | 4,980,949 |  |  | 5,037,089 |  |  | 39.9 | % |
| Due after five years through ten years | 2,107,695 |  |  | 2,173,611 |  |  | 17.2 | % |
| Due after ten years | 397,393 |  |  | 413,812 |  |  | 3.3 | % |
|  | 7,817,416 |  |  | 7,955,096 |  |  | 63.0 | % |
| Agency RMBS | 1,609,193 |  |  | 1,632,768 |  |  | 12.9 | % |
| CMBS | 1,321,029 |  |  | 1,368,890 |  |  | 10.9 | % |
| Non-Agency RMBS | 59,308 |  |  | 58,952 |  |  | 0.5 | % |
| ABS | 1,600,758 |  |  | 1,600,535 |  |  | 12.7 | % |
| Total | $ | 12,407,704 |  |  | $ | 12,616,241 |  |  | 100.0 | % |
| At December 31, 2018 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 430,390 |  |  | $ | 426,142 |  |  | 3.7 | % |
| Due after one year through five years | 4,751,064 |  |  | 4,691,263 |  |  | 41.0 | % |
| Due after five years through ten years | 1,762,452 |  |  | 1,697,737 |  |  | 14.8 | % |
| Due after ten years | 210,133 |  |  | 206,077 |  |  | 1.8 | % |
|  | 7,154,039 |  |  | 7,021,219 |  |  | 61.3 | % |
| Agency RMBS | 1,666,684 |  |  | 1,643,308 |  |  | 14.4 | % |
| CMBS | 1,103,507 |  |  | 1,092,530 |  |  | 9.6 | % |
| Non-Agency RMBS | 40,732 |  |  | 40,687 |  |  | 0.4 | % |
| ABS | 1,651,350 |  |  | 1,637,603 |  |  | 14.3 | % |
| Total | $ | 11,616,312 |  |  | $ | 11,435,347 |  |  | 100.0 | % |
FIXED MATURITIES AND EQUITIES IN AN UNREALIZED LOSS POSITION | The following table summarizes fixed maturities and equity securities 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 September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 12,694 |  |  | $ | (91 | ) |  | $ | 558,741 |  |  | $ | (2,867 | ) |  | $ | 571,435 |  |  | $ | (2,958 | ) |
| Non-U.S. government | 114,923 |  |  | (7,546 | ) |  | 179,943 |  |  | (4,462 | ) |  | 294,866 |  |  | (12,008 | ) |
| Corporate debt | 218,327 |  |  | (11,414 | ) |  | 601,466 |  |  | (11,514 | ) |  | 819,793 |  |  | (22,928 | ) |
| Agency RMBS | 241,041 |  |  | (2,394 | ) |  | 200,089 |  |  | (842 | ) |  | 441,130 |  |  | (3,236 | ) |
| CMBS | 24,550 |  |  | (65 | ) |  | 100,241 |  |  | (800 | ) |  | 124,791 |  |  | (865 | ) |
| Non-Agency RMBS | 5,409 |  |  | (1,135 | ) |  | 19,393 |  |  | (451 | ) |  | 24,802 |  |  | (1,586 | ) |
| ABS | 402,080 |  |  | (5,186 | ) |  | 420,285 |  |  | (1,011 | ) |  | 822,365 |  |  | (6,197 | ) |
| Municipals | 7,747 |  |  | (109 | ) |  | 9,601 |  |  | (68 | ) |  | 17,348 |  |  | (177 | ) |
| Total fixed maturities | $ | 1,026,771 |  |  | $ | (27,940 | ) |  | $ | 2,089,759 |  |  | $ | (22,015 | ) |  | $ | 3,116,530 |  |  | $ | (49,955 | ) |
| At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 374,030 |  |  | $ | (7,659 | ) |  | $ | 424,439 |  |  | $ | (1,018 | ) |  | $ | 798,469 |  |  | $ | (8,677 | ) |
| Non-U.S. government | 44,339 |  |  | (2,004 | ) |  | 303,376 |  |  | (14,116 | ) |  | 347,715 |  |  | (16,120 | ) |
| Corporate debt | 1,439,378 |  |  | (58,915 | ) |  | 2,547,135 |  |  | (69,529 | ) |  | 3,986,513 |  |  | (128,444 | ) |
| Agency RMBS | 940,645 |  |  | (29,255 | ) |  | 117,181 |  |  | (629 | ) |  | 1,057,826 |  |  | (29,884 | ) |
| CMBS | 455,582 |  |  | (11,430 | ) |  | 353,802 |  |  | (2,365 | ) |  | 809,384 |  |  | (13,795 | ) |
| Non-Agency RMBS | 9,494 |  |  | (1,170 | ) |  | 11,432 |  |  | (112 | ) |  | 20,926 |  |  | (1,282 | ) |
| ABS | 237,237 |  |  | (2,755 | ) |  | 1,150,692 |  |  | (12,485 | ) |  | 1,387,929 |  |  | (15,240 | ) |
| Municipals | 68,814 |  |  | (1,373 | ) |  | 9,894 |  |  | (24 | ) |  | 78,708 |  |  | (1,397 | ) |
| Total fixed maturities | $ | 3,569,519 |  |  | $ | (114,561 | ) |  | $ | 4,917,951 |  |  | $ | (100,278 | ) |  | $ | 8,487,470 |  |  | $ | (214,839 | ) |
MORTGAGE LOANS NET OF VALUATION ALLOWANCE | The following table provides details of the Company's mortgage loans held-for-investment:
|  | September 30, 2019 |  | December 31, 2018 |
|  | Carrying value |  | % of Total |  | Carrying value |  | % of Total |
| Mortgage Loans held-for-investment: |  |  |  |  |  |  |  |
| Commercial | $ | 407,790 |  |  | 100 | % |  | $ | 298,650 |  |  | 100 | % |
| Total Mortgage Loans held-for-investment | $ | 407,790 |  |  | 100 | % |  | $ | 298,650 |  |  | 100 | % |
PORTFOLIO OF OTHER INVESTMENTS | The following tables provide a summary of the Company's other investments, together with additional information relating to the liquidity of each category:
|  | Fair value |  | Redemption frequency (if currently eligible) |  | Redemption notice period |
| At September 30, 2019 |  |  |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 30,617 |  |  | 4 | % |  | Annually |  | 60 days |
| Multi-strategy funds | 166,079 |  |  | 21 | % |  | Quarterly, Semi-annually |  | 60-90 days |
| Direct lending funds | 275,619 |  |  | 35 | % |  | n/a |  | n/a |
| Private equity funds | 67,210 |  |  | 9 | % |  | n/a |  | n/a |
| Real estate funds | 130,209 |  |  | 17 | % |  | n/a |  | n/a |
| CLO-Equities | 15,454 |  |  | 2 | % |  | n/a |  | n/a |
| Other privately held investments | 30,719 |  |  | 4 | % |  | n/a |  | n/a |
| Overseas deposits | 63,293 |  |  | 8 | % |  | n/a |  | n/a |
| Total other investments | $ | 779,200 |  |  | 100 | % |  |  |  |  |
| At December 31, 2018 |  |  |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 26,779 |  |  | 3 | % |  | Annually |  | 60 days |
| Multi-strategy funds | 167,819 |  |  | 22 | % |  | Quarterly, Semi-annually, Annually |  | 45-95 days |
| Direct lending funds | 274,478 |  |  | 35 | % |  | n/a |  | n/a |
| Private equity funds | 64,566 |  |  | 8 | % |  | n/a |  | n/a |
| Real estate funds | 84,202 |  |  | 11 | % |  | n/a |  | n/a |
| CLO-Equities | 21,271 |  |  | 2 | % |  | n/a |  | n/a |
| Other privately held investments | 44,518 |  |  | 6 | % |  | n/a |  | n/a |
| Overseas deposits | 104,154 |  |  | 13 | % |  | n/a |  | n/a |
| Total other investments | $ | 787,787 |  |  | 100 | % |  |  |  |  |
n/a - not applicable
NET INVESTMENT INCOME | Net investment income was derived from the following sources:
NET REALIZED INVESTMENT GAINS (LOSSES) | The following table provides an analysis of net investment gains (losses):
|  | Three months ended September 30, |  | Nine months ended September 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
| Gross realized investment gains |  |  |  |  |  |  |  |
| Fixed maturities and short-term investments | $ | 32,475 |  |  | $ | 4,543 |  |  | $ | 61,882 |  |  | $ | 41,932 |  |
| Equity securities | 1,825 |  |  | 15 |  |  | 3,424 |  |  | 18,675 |  |
| Gross realized investment gains | 34,300 |  |  | 4,558 |  |  | 65,306 |  |  | 60,607 |  |
| Gross realized investment losses |  |  |  |  |  |  |  |
| Fixed maturities and short-term investments | (14,557 | ) |  | (25,926 | ) |  | (44,813 | ) |  | (113,903 | ) |
| Equity securities | (80 | ) |  | — |  |  | (203 | ) |  | (1,231 | ) |
| Gross realized investment losses | (14,637 | ) |  | (25,926 | ) |  | (45,016 | ) |  | (115,134 | ) |
| Net OTTI recognized in net income | (1,458 | ) |  | (5,546 | ) |  | (6,328 | ) |  | (7,634 | ) |
| Change in fair value of investment derivatives(1) | 2,592 |  |  | 2,626 |  |  | 287 |  |  | 9,782 |  |
| Net unrealized gains (losses) on equity securities | (6,270 | ) |  | 6,660 |  |  | 34,273 |  |  | (25,172 | ) |
| Net investment gains (losses) | $ | 14,527 |  |  | $ | (17,628 | ) |  | $ | 48,522 |  |  | $ | (77,551 | ) |
(1) Refer to Note 5 'Derivative Instruments
OTTI RECOGNIZED IN EARNINGS BY ASSET CLASS | The following table summarizes the OTTI recognized in net income by asset class:
ROLL FORWARD OF CREDIT LOSSES FOR WHICH A PORTION OF OTTI RECOGNIZED IN AOCI | The following table provides a roll forward of the credit losses ("credit loss table") before income taxes, for which a component of the OTTI charge was recognized in AOCI:

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