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INVESTMENTS (TABLES) | 3 Months Ended
--- | ---
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
AMORTIZED COST/COST AND FAIR VALUES OF FIXED MATURITIES AND EQUITIES | The amortized cost or cost and fair values of our fixed maturities and equities were as follows:
|  | Amortized Cost or Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Non-credit OTTI in AOCI(5) |
| At March 31, 2016 |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 1,552,689 |  |  | $ | 20,614 |  |  | $ | (3,123 | ) |  | $ | 1,570,180 |  |  | $ | — |  |
| Non-U.S. government | 753,923 |  |  | 6,718 |  |  | (39,918 | ) |  | 720,723 |  |  | — |  |
| Corporate debt | 4,423,369 |  |  | 55,031 |  |  | (53,358 | ) |  | 4,425,042 |  |  | — |  |
| Agency RMBS(1) | 2,377,262 |  |  | 45,420 |  |  | (1,381 | ) |  | 2,421,301 |  |  | — |  |
| CMBS(2) | 1,099,346 |  |  | 13,221 |  |  | (5,883 | ) |  | 1,106,684 |  |  | — |  |
| Non-Agency RMBS | 94,704 |  |  | 1,584 |  |  | (1,266 | ) |  | 95,022 |  |  | (862 | ) |
| ABS(3) | 1,359,752 |  |  | 1,199 |  |  | (17,801 | ) |  | 1,343,150 |  |  | — |  |
| Municipals(4) | 151,737 |  |  | 4,758 |  |  | (529 | ) |  | 155,966 |  |  | — |  |
| Total fixed maturities | $ | 11,812,782 |  |  | $ | 148,545 |  |  | $ | (123,259 | ) |  | $ | 11,838,068 |  |  | $ | (862 | ) |
| Equity securities |  |  |  |  |  |  |  |  |  |
| Common stocks | $ | 292 |  |  | $ | 96 |  |  | $ | (210 | ) |  | $ | 178 |  |  |  |
| Exchange-traded funds | 471,879 |  |  | 32,339 |  |  | (3,550 | ) |  | 500,668 |  |  |  |
| Bond mutual funds | 133,120 |  |  | 3,359 |  |  | — |  |  | 136,479 |  |  |  |
| Total equity securities | $ | 605,291 |  |  | $ | 35,794 |  |  | $ | (3,760 | ) |  | $ | 637,325 |  |  |  |
| At December 31, 2015 |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 1,673,617 |  |  | $ | 1,545 |  |  | $ | (23,213 | ) |  | $ | 1,651,949 |  |  | $ | — |  |
| Non-U.S. government | 809,025 |  |  | 2,312 |  |  | (72,332 | ) |  | 739,005 |  |  | — |  |
| Corporate debt | 4,442,315 |  |  | 16,740 |  |  | (96,286 | ) |  | 4,362,769 |  |  | — |  |
| Agency RMBS(1) | 2,236,138 |  |  | 22,773 |  |  | (9,675 | ) |  | 2,249,236 |  |  | — |  |
| CMBS(2) | 1,088,595 |  |  | 3,885 |  |  | (9,182 | ) |  | 1,083,298 |  |  | — |  |
| Non-Agency RMBS | 99,989 |  |  | 1,992 |  |  | (973 | ) |  | 101,008 |  |  | (875 | ) |
| ABS(3) | 1,387,919 |  |  | 952 |  |  | (17,601 | ) |  | 1,371,270 |  |  | — |  |
| Municipals(4) | 160,041 |  |  | 2,319 |  |  | (1,146 | ) |  | 161,214 |  |  | — |  |
| Total fixed maturities | $ | 11,897,639 |  |  | $ | 52,518 |  |  | $ | (230,408 | ) |  | $ | 11,719,749 |  |  | $ | (875 | ) |
| Equity securities |  |  |  |  |  |  |  |  |  |
| Common stocks | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |
| Exchange-traded funds | 447,524 |  |  | 31,211 |  |  | (4,762 | ) |  | 473,973 |  |  |  |
| Bond mutual funds | 128,252 |  |  | — |  |  | (4,227 | ) |  | 124,025 |  |  |  |
| Total equity securities | $ | 575,776 |  |  | $ | 31,211 |  |  | $ | (8,989 | ) |  | $ | 597,998 |  |  |  |
(1) | Residential mortgage-backed securities (RMBS) originated by U.S. agencies.
(2) | Commercial mortgage-backed securities (CMBS).
(3) | Asset-backed securities (ABS) include debt tranched securities collateralized primarily by auto loans, student loans, credit cards, and other asset types. This asset class also includes collateralized loan obligations (CLOs) and collateralized debt obligations (CDOs).
(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 of securities. It does not include the change in fair value subsequent to the impairment measurement date.
CONTRACTUAL MATURITIES OF FIXED MATURITIES | The contractual maturities of fixed maturities are shown below. 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.
|  | Amortized Cost |  | Fair Value |  | % of Total Fair Value |
| At March 31, 2016 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 295,599 |  |  | $ | 291,510 |  |  | 2.5 | % |
| Due after one year through five years | 3,994,127 |  |  | 3,985,100 |  |  | 33.7 | % |
| Due after five years through ten years | 2,263,573 |  |  | 2,264,238 |  |  | 19.1 | % |
| Due after ten years | 328,419 |  |  | 331,063 |  |  | 2.8 | % |
|  | 6,881,718 |  |  | 6,871,911 |  |  | 58.1 | % |
| Agency RMBS | 2,377,262 |  |  | 2,421,301 |  |  | 20.5 | % |
| CMBS | 1,099,346 |  |  | 1,106,684 |  |  | 9.3 | % |
| Non-Agency RMBS | 94,704 |  |  | 95,022 |  |  | 0.8 | % |
| ABS | 1,359,752 |  |  | 1,343,150 |  |  | 11.3 | % |
| Total | $ | 11,812,782 |  |  | $ | 11,838,068 |  |  | 100.0 | % |
| At December 31, 2015 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 291,368 |  |  | $ | 289,571 |  |  | 2.5 | % |
| Due after one year through five years | 4,217,515 |  |  | 4,142,802 |  |  | 35.3 | % |
| Due after five years through ten years | 2,263,684 |  |  | 2,181,525 |  |  | 18.6 | % |
| Due after ten years | 312,431 |  |  | 301,039 |  |  | 2.6 | % |
|  | 7,084,998 |  |  | 6,914,937 |  |  | 59.0 | % |
| Agency RMBS | 2,236,138 |  |  | 2,249,236 |  |  | 19.2 | % |
| CMBS | 1,088,595 |  |  | 1,083,298 |  |  | 9.2 | % |
| Non-Agency RMBS | 99,989 |  |  | 101,008 |  |  | 0.9 | % |
| ABS | 1,387,919 |  |  | 1,371,270 |  |  | 11.7 | % |
| Total | $ | 11,897,639 |  |  | $ | 11,719,749 |  |  | 100.0 | % |
FIXED MATURITIES AND EQUITIES IN AN UNREALIZED LOSS POSITION | The following table summarizes fixed maturities and equities 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, 2016 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 84,342 |  |  | $ | (3,030 | ) |  | $ | 146,502 |  |  | $ | (93 | ) |  | $ | 230,844 |  |  | $ | (3,123 | ) |
| Non-U.S. government | 135,920 |  |  | (30,440 | ) |  | 220,140 |  |  | (9,478 | ) |  | 356,060 |  |  | (39,918 | ) |
| Corporate debt | 388,621 |  |  | (24,425 | ) |  | 1,019,187 |  |  | (28,933 | ) |  | 1,407,808 |  |  | (53,358 | ) |
| Agency RMBS | 179,155 |  |  | (850 | ) |  | 143,472 |  |  | (531 | ) |  | 322,627 |  |  | (1,381 | ) |
| CMBS | 102,506 |  |  | (1,775 | ) |  | 392,674 |  |  | (4,108 | ) |  | 495,180 |  |  | (5,883 | ) |
| Non-Agency RMBS | 5,419 |  |  | (275 | ) |  | 58,771 |  |  | (991 | ) |  | 64,190 |  |  | (1,266 | ) |
| ABS | 579,638 |  |  | (11,397 | ) |  | 536,264 |  |  | (6,404 | ) |  | 1,115,902 |  |  | (17,801 | ) |
| Municipals | 14,966 |  |  | (509 | ) |  | 2,635 |  |  | (20 | ) |  | 17,601 |  |  | (529 | ) |
| Total fixed maturities | $ | 1,490,567 |  |  | $ | (72,701 | ) |  | $ | 2,519,645 |  |  | $ | (50,558 | ) |  | $ | 4,010,212 |  |  | $ | (123,259 | ) |
| Equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Common stocks | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (210 | ) |  | $ | — |  |  | $ | (210 | ) |
| Exchange-traded funds | — |  |  | — |  |  | 72,146 |  |  | (3,550 | ) |  | 72,146 |  |  | (3,550 | ) |
| Bond mutual funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Total equity securities | $ | — |  |  | $ | — |  |  | $ | 72,146 |  |  | $ | (3,760 | ) |  | $ | 72,146 |  |  | $ | (3,760 | ) |
| At December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 84,179 |  |  | $ | (7,622 | ) |  | $ | 1,474,202 |  |  | $ | (15,591 | ) |  | $ | 1,558,381 |  |  | $ | (23,213 | ) |
| Non-U.S. government | 170,269 |  |  | (50,841 | ) |  | 317,693 |  |  | (21,491 | ) |  | 487,962 |  |  | (72,332 | ) |
| Corporate debt | 340,831 |  |  | (33,441 | ) |  | 2,845,375 |  |  | (62,845 | ) |  | 3,186,206 |  |  | (96,286 | ) |
| Agency RMBS | 64,792 |  |  | (1,609 | ) |  | 1,073,566 |  |  | (8,066 | ) |  | 1,138,358 |  |  | (9,675 | ) |
| CMBS | 75,627 |  |  | (1,579 | ) |  | 659,480 |  |  | (7,603 | ) |  | 735,107 |  |  | (9,182 | ) |
| Non-Agency RMBS | 5,283 |  |  | (210 | ) |  | 43,199 |  |  | (763 | ) |  | 48,482 |  |  | (973 | ) |
| ABS | 562,599 |  |  | (11,158 | ) |  | 667,448 |  |  | (6,443 | ) |  | 1,230,047 |  |  | (17,601 | ) |
| Municipals | 14,214 |  |  | (310 | ) |  | 64,104 |  |  | (836 | ) |  | 78,318 |  |  | (1,146 | ) |
| Total fixed maturities | $ | 1,317,794 |  |  | $ | (106,770 | ) |  | $ | 7,145,067 |  |  | $ | (123,638 | ) |  | $ | 8,462,861 |  |  | $ | (230,408 | ) |
| Equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Common stocks | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |
| Exchange-traded funds | 2,331 |  |  | (313 | ) |  | 110,972 |  |  | (4,449 | ) |  | 113,303 |  |  | (4,762 | ) |
| Bond mutual funds | — |  |  | — |  |  | 124,025 |  |  | (4,227 | ) |  | 124,025 |  |  | (4,227 | ) |
| Total equity securities | $ | 2,331 |  |  | $ | (313 | ) |  | $ | 234,997 |  |  | $ | (8,676 | ) |  | $ | 237,328 |  |  | $ | (8,989 | ) |
MORTGAGE LOANS NET OF VALUATION ALLOWANCE | The following table provides a breakdown of our mortgage loans held-for-investment:
|  | March 31, 2016 |  | December 31, 2015 |
|  | Carrying Value |  | % of Total |  | Carrying Value |  | % of Total |
| Mortgage Loans held-for-investment: |  |  |  |  |  |  |  |
| Commercial | $ | 267,589 |  |  | 100 | % |  | $ | 206,277 |  |  | 100 | % |
|  | 267,589 |  |  | 100 | % |  | 206,277 |  |  | 100 | % |
| Valuation allowances | — |  |  | — | % |  | — |  |  | — | % |
| Total Mortgage Loans held-for-investment | $ | 267,589 |  |  | 100 | % |  | $ | 206,277 |  |  | 100 | % |
PORTFOLIO OF OTHER INVESTMENTS | The following table provides a breakdown of our investments in hedge funds, direct lending funds, private equity funds, real estate funds and CLO Equities, together with additional information relating to the liquidity of each category:
|  | Fair Value |  | Redemption Frequency (if currently eligible) |  | Redemption Notice Period |
| At March 31, 2016 |  |  |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 128,502 |  |  | 15 | % |  | Quarterly, Semi-annually, Annually |  | 45-60 days |
| Multi-strategy funds | 312,211 |  |  | 36 | % |  | Quarterly, Semi-annually |  | 60-95 days |
| Event-driven funds | 146,428 |  |  | 17 | % |  | Quarterly, Annually |  | 45-60 days |
| Leveraged bank loan funds | 65 |  |  | — | % |  | n/a |  | n/a |
| Direct lending funds | 112,889 |  |  | 13 | % |  | n/a |  | n/a |
| Private equity funds | 93,783 |  |  | 11 | % |  | n/a |  | n/a |
| Real estate funds | 5,390 |  |  | 1 | % |  | n/a |  | n/a |
| CLO - Equities | 60,371 |  |  | 7 | % |  | n/a |  | n/a |
| Total other investments | $ | 859,639 |  |  | 100 | % |  |  |  |  |
| At December 31, 2015 |  |  |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 154,348 |  |  | 19 | % |  | Quarterly, Semi-annually, Annually |  | 45-60 days |
| Multi-strategy funds | 355,073 |  |  | 43 | % |  | Quarterly, Semi-annually |  | 60-95 days |
| Event-driven funds | 147,287 |  |  | 18 | % |  | Quarterly, Annually |  | 45-60 days |
| Leveraged bank loan funds | 65 |  |  | — | % |  | n/a |  | n/a |
| Direct lending funds | 90,120 |  |  | 11 | % |  | n/a |  | n/a |
| Private equity funds | — |  |  | — | % |  | n/a |  | n/a |
| Real estate funds | 4,929 |  |  | 1 | % |  | n/a |  | n/a |
| CLO - Equities | 64,934 |  |  | 8 | % |  | n/a |  | n/a |
| Total other investments | $ | 816,756 |  |  | 100 | % |  |  |  |  |
n/a - not applicable
NET INVESTMENT INCOME | Net investment income was derived from the following sources:
|  | Three months ended March 31, |
|  | 2016 |  | 2015 |
| Fixed maturities | $ | 75,975 |  |  | $ | 66,088 |  |
| Other investments | (26,878 | ) |  | 30,935 |  |
| Equity securities | 5,145 |  |  | 1,676 |  |
| Mortgage loans | 1,684 |  |  | 13 |  |
| Cash and cash equivalents | 1,434 |  |  | 1,099 |  |
| Short-term investments | 206 |  |  | 69 |  |
| Gross investment income | 57,566 |  |  | 99,880 |  |
| Investment expenses | (8,402 | ) |  | (7,773 | ) |
| Net investment income | $ | 49,164 |  |  | $ | 92,107 |  |
NET REALIZED INVESTMENT LOSSES | The following table provides an analysis of net realized investment losses:
|  | Three months ended March 31, |
|  | 2016 |  | 2015 |
| Gross realized gains |  |  |  |
| Fixed maturities and short-term investments | $ | 16,164 |  |  | $ | 15,661 |  |
| Equities | 3,541 |  |  | 38 |  |
| Gross realized gains | 19,705 |  |  | 15,699 |  |
| Gross realized losses |  |  |  |
| Fixed maturities and short-term investments | (59,177 | ) |  | (43,091 | ) |
| Equities | (14,787 | ) |  | (124 | ) |
| Gross realized losses | (73,964 | ) |  | (43,215 | ) |
| Net OTTI recognized in earnings | (9,729 | ) |  | (17,568 | ) |
| Change in fair value of investment derivatives(1) | (2,520 | ) |  | 2,531 |  |
| Net realized investment losses | $ | (66,508 | ) |  | $ | (42,553 | ) |
(1) Refer to Note 5 – Derivative Instruments
OTTI RECOGNIZED IN EARNINGS BY ASSET CLASS | The following table summarizes the OTTI recognized in earnings by asset class:
|  | Three months ended March 31, |
|  | 2016 |  | 2015 |
| Fixed maturities: |  |  |  |
| Non-U.S. government | $ | — |  |  | $ | 1,422 |  |
| Corporate debt | 7,169 |  |  | 16,120 |  |
| Non-Agency RMBS | — |  |  | 4 |  |
| ABS | — |  |  | 22 |  |
|  | 7,169 |  |  | 17,568 |  |
| Equity Securities |  |  |  |
| Exchange-traded funds | 2,560 |  |  | — |  |
|  | 2,560 |  |  | — |  |
| Total OTTI recognized in earnings | $ | 9,729 |  |  | $ | 17,568 |  |
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, before income taxes, for which a portion of the OTTI was recognized in AOCI:
|  | Three months ended March 31, |
|  | 2016 |  | 2015 |
| Balance at beginning of period | $ | 1,506 |  |  | $ | 1,531 |  |
| Credit impairments recognized on securities not previously impaired | — |  |  | — |  |
| Additional credit impairments recognized on securities previously impaired | — |  |  | 10 |  |
| Change in timing of future cash flows on securities previously impaired | — |  |  | — |  |
| Intent to sell of securities previously impaired | — |  |  | — |  |
| Securities sold/redeemed/matured | — |  |  | — |  |
| Balance at end of period | $ | 1,506 |  |  | $ | 1,541 |  |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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