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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
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 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 | ) |
| At December 31, 2017 |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 1,727,643 |  |  | $ | 1,735 |  |  | $ | (16,909 | ) |  | $ | 1,712,469 |  |  | $ | — |  |
| Non-U.S. government | 798,582 |  |  | 17,240 |  |  | (9,523 | ) |  | 806,299 |  |  | — |  |
| Corporate debt | 5,265,795 |  |  | 61,922 |  |  | (29,851 | ) |  | 5,297,866 |  |  | — |  |
| Agency RMBS(1) | 2,414,720 |  |  | 8,132 |  |  | (27,700 | ) |  | 2,395,152 |  |  | — |  |
| CMBS(2) | 776,715 |  |  | 4,138 |  |  | (3,125 | ) |  | 777,728 |  |  | — |  |
| Non-Agency RMBS | 45,713 |  |  | 1,917 |  |  | (799 | ) |  | 46,831 |  |  | (853 | ) |
| ABS(3) | 1,432,884 |  |  | 5,391 |  |  | (1,994 | ) |  | 1,436,281 |  |  | — |  |
| Municipals(4) | 149,167 |  |  | 1,185 |  |  | (972 | ) |  | 149,380 |  |  | — |  |
| Total fixed maturities | $ | 12,611,219 |  |  | $ | 101,660 |  |  | $ | (90,873 | ) |  | $ | 12,622,006 |  |  | $ | (853 | ) |
(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 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 |  |
| At December 31, 2017 |  |  |  |  |  |  |  |
| Equity securities |  |  |  |  |  |  |  |
| Common stocks | $ | 22,836 |  |  | $ | 3,412 |  |  | $ | (590 | ) |  | $ | 25,658 |  |
| Exchange-traded funds | 356,252 |  |  | 71,675 |  |  | (294 | ) |  | 427,633 |  |
| Bond mutual funds | 173,779 |  |  | 9,440 |  |  | (999 | ) |  | 182,220 |  |
| Total equity securities | $ | 552,867 |  |  | $ | 84,527 |  |  | $ | (1,883 | ) |  | $ | 635,511 |  |
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 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 | % |
| At December 31, 2017 |  |  |  |  |  |
| Maturity |  |  |  |  |  |
| Due in one year or less | $ | 486,659 |  |  | $ | 484,663 |  |  | 3.8 | % |
| Due after one year through five years | 4,906,207 |  |  | 4,912,189 |  |  | 38.9 | % |
| Due after five years through ten years | 2,338,964 |  |  | 2,350,433 |  |  | 18.6 | % |
| Due after ten years | 209,357 |  |  | 218,729 |  |  | 1.7 | % |
|  | 7,941,187 |  |  | 7,966,014 |  |  | 63.0 | % |
| Agency RMBS | 2,414,720 |  |  | 2,395,152 |  |  | 19.0 | % |
| CMBS | 776,715 |  |  | 777,728 |  |  | 6.2 | % |
| Non-Agency RMBS | 45,713 |  |  | 46,831 |  |  | 0.4 | % |
| ABS | 1,432,884 |  |  | 1,436,281 |  |  | 11.4 | % |
| Total | $ | 12,611,219 |  |  | $ | 12,622,006 |  |  | 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 December 31, 2018(1) |  |  |  |  |  |  |  |  |  |  |  |
| 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 | ) |
| At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
| Fixed maturities |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government and agency | $ | 194,916 |  |  | $ | (5,963 | ) |  | $ | 1,389,792 |  |  | $ | (10,946 | ) |  | $ | 1,584,708 |  |  | $ | (16,909 | ) |
| Non-U.S. government | 62,878 |  |  | (6,806 | ) |  | 204,110 |  |  | (2,717 | ) |  | 266,988 |  |  | (9,523 | ) |
| Corporate debt | 407,300 |  |  | (11,800 | ) |  | 2,041,845 |  |  | (18,051 | ) |  | 2,449,145 |  |  | (29,851 | ) |
| Agency RMBS | 759,255 |  |  | (17,453 | ) |  | 1,172,313 |  |  | (10,247 | ) |  | 1,931,568 |  |  | (27,700 | ) |
| CMBS | 31,607 |  |  | (703 | ) |  | 348,943 |  |  | (2,422 | ) |  | 380,550 |  |  | (3,125 | ) |
| Non-Agency RMBS | 8,029 |  |  | (788 | ) |  | 4,197 |  |  | (11 | ) |  | 12,226 |  |  | (799 | ) |
| ABS | 57,298 |  |  | (570 | ) |  | 392,170 |  |  | (1,424 | ) |  | 449,468 |  |  | (1,994 | ) |
| Municipals | 11,230 |  |  | (269 | ) |  | 65,632 |  |  | (703 | ) |  | 76,862 |  |  | (972 | ) |
| Total fixed maturities | $ | 1,532,513 |  |  | $ | (44,352 | ) |  | $ | 5,619,002 |  |  | $ | (46,521 | ) |  | $ | 7,151,515 |  |  | $ | (90,873 | ) |
| Equity securities |  |  |  |  |  |  |  |  |  |  |  |
| Common stocks | $ | — |  |  | $ | — |  |  | $ | 3,202 |  |  | $ | (590 | ) |  | $ | 3,202 |  |  | $ | (590 | ) |
| Exchange-traded funds | — |  |  | — |  |  | 12,323 |  |  | (294 | ) |  | 12,323 |  |  | (294 | ) |
| Bond mutual funds | — |  |  | — |  |  | 12,184 |  |  | (999 | ) |  | 12,184 |  |  | (999 | ) |
| Total equity securities | $ | — |  |  | $ | — |  |  | $ | 27,709 |  |  | $ | (1,883 | ) |  | $ | 27,709 |  |  | $ | (1,883 | ) |
(1) | Effective January 1, 2018, the Company adopted ASU No. 2016-01, which requires equity securities to be measured at fair value with changes in fair value recognized in net income therefore equity securities at fair value are excluded from the table above at December 31, 2018.
MORTGAGE LOANS NET OF VALUATION ALLOWANCE | The following table provides details of the Company's mortgage loans held-for-investment:
|  | December 31, 2018 |  | December 31, 2017 |
|  | Carrying value |  | % of Total |  | Carrying value |  | % of Total |
| Mortgage Loans held-for-investment: |  |  |  |  |  |  |  |
| Commercial | $ | 298,650 |  |  | 100 | % |  | $ | 325,062 |  |  | 100 | % |
| Total Mortgage Loans held-for-investment | $ | 298,650 |  |  | 100 | % |  | $ | 325,062 |  |  | 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 December 31, 2018 |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 26,779 |  |  | 3 | % |  | Annually |  | 60 days |
| Multi-strategy funds | 153,883 |  |  | 20 | % |  | Quarterly, Semi-annually |  | 60-95 days |
| Event-driven funds | 13,936 |  |  | 2 | % |  | Annually |  | 45 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 | % |  |  |  |  |
| At December 31, 2017 |  |  |  |  |  |  |  |
| Long/short equity funds | $ | 38,470 |  |  | 4 | % |  | Annually |  | 60 days |
| Multi-strategy funds | 286,164 |  |  | 28 | % |  | Quarterly, Semi-annually |  | 60-95 days |
| Event-driven funds | 39,177 |  |  | 4 | % |  | Annually |  | 45 days |
| Direct lending funds | 250,681 |  |  | 25 | % |  | n/a |  | n/a |
| Private equity funds | 68,812 |  |  | 7 | % |  | n/a |  | n/a |
| Real estate funds | 50,009 |  |  | 5 | % |  | n/a |  | n/a |
| CLO-Equities | 31,413 |  |  | 2 | % |  | n/a |  | n/a |
| Other privately held investments | 46,430 |  |  | 5 | % |  | n/a |  | n/a |
| Overseas deposits | 198,217 |  |  | 20 | % |  | n/a |  | n/a |
| Total other investments | $ | 1,009,373 |  |  | 100 | % |  |  |  |  |
n/a – not applicable
NET INVESTMENT INCOME | Net investment income was derived from the following sources:
| Year ended December 31, | 2018 |  | 2017 |  | 2016 |
| Fixed maturities | $ | 356,273 |  |  | $ | 312,662 |  |  | $ | 305,459 |  |
| Other investments | 48,959 |  |  | 76,858 |  |  | 42,514 |  |
| Equity securities | 10,077 |  |  | 14,919 |  |  | 16,306 |  |
| Mortgage loans | 13,566 |  |  | 10,780 |  |  | 7,996 |  |
| Cash and cash equivalents | 27,566 |  |  | 10,057 |  |  | 9,209 |  |
| Short-term investments | 9,365 |  |  | 2,718 |  |  | 2,060 |  |
| Gross investment income | 465,806 |  |  | 427,994 |  |  | 383,544 |  |
| Investment expenses | (27,299 | ) |  | (27,189 | ) |  | (30,209 | ) |
| Net investment income | $ | 438,507 |  |  | $ | 400,805 |  |  | $ | 353,335 |  |
NET REALIZED INVESTMENT GAINS (LOSSES) | The following table provides an analysis of net investment gains (losses):
| Year ended December 31, | 2018 |  | 2017 |  | 2016 |
| Gross realized investment gains |  |  |  |  |  |
| Fixed maturities and short-term investments | $ | 46,067 |  |  | $ | 72,046 |  |  | $ | 86,267 |  |
| Equity securities | 20,435 |  |  | 78,343 |  |  | 19,104 |  |
| Gross realized investment gains | 66,502 |  |  | 150,389 |  |  | 105,371 |  |
| Gross realized investment losses |  |  |  |  |  |
| Fixed maturities and short-term investments | (142,153 | ) |  | (98,442 | ) |  | (134,460 | ) |
| Equity securities | (3,389 | ) |  | (959 | ) |  | (16,155 | ) |
| Gross realized investment losses | (145,542 | ) |  | (99,401 | ) |  | (150,615 | ) |
| Net OTTI charge recognized in net income | (9,733 | ) |  | (14,493 | ) |  | (26,210 | ) |
| Change in fair value of investment derivatives(1) | 5,445 |  |  | (8,269 | ) |  | 10,929 |  |
| Change in fair value of equity securities(2) | (66,890 | ) |  | — |  |  | — |  |
| Net investment gains (losses) | $ | (150,218 | ) |  | $ | 28,226 |  |  | $ | (60,525 | ) |
(1) | Refer to Note 8 'Derivative Instruments'
(2) | Effective January 1, 2018, the Company adopted ASU No. 2016-01. The change in fair value of equity securities is now recognized in net income.
OTTI RECOGNIZED IN EARNINGS BY ASSET CLASS | The following table summarizes the OTTI charge recognized in net income by asset class:
| Year ended December 31, | 2018 |  | 2017 |  | 2016 |
| Fixed maturities: |  |  |  |  |  |
| Non-U.S. government | $ | 4,697 |  |  | $ | 8,187 |  |  | $ | 3,557 |  |
| Corporate debt | 4,995 |  |  | 6,306 |  |  | 20,093 |  |
| Non-Agency CMBS | 41 |  |  | — |  |  | — |  |
|  | 9,733 |  |  | 14,493 |  |  | 23,650 |  |
| Equity Securities |  |  |  |  |  |
| Exchange-traded funds | — |  |  | — |  |  | 2,560 |  |
|  | — |  |  | — |  |  | 2,560 |  |
| Total OTTI recognized in net income | $ | 9,733 |  |  | $ | 14,493 |  |  | $ | 26,210 |  |
ROLL FORWARD OF CREDIT LOSSES FOR WHICH A PORTION OF OTTI RECOGNIZED IN AOCI | The following table provides a roll forward of credit losses ("credit loss table") before income taxes, for which a component of the OTTI charge was recognized in AOCI:
| Year ended December 31, | 2018 |  | 2017 |
| Balance at beginning of period | $ | 1,494 |  |  | $ | 1,493 |  |
| Credit impairments recognized on securities not previously impaired | — |  |  | — |  |
| Additional credit impairments recognized on securities previously impaired | 8 |  |  | 13 |  |
| Change in timing of future cash flows on securities previously impaired | — |  |  | — |  |
| Intent to sell of securities previously impaired | — |  |  | — |  |
| Securities sold/redeemed/matured | (992 | ) |  | (12 | ) |
| Balance at end of period | $ | 510 |  |  | $ | 1,494 |  |
RESTRICTED INVESTMENTS | The fair value of the Company's restricted investments and cash primarily relates to these items, as noted in the table below.
| At December 31, |  | 2018 |  | 2017 |
| Collateral in Trust for inter-company agreements |  | $ | 2,121,522 |  |  | $ | 3,310,180 |  |
| Collateral for secured letter of credit facility |  | 470,051 |  |  | 386,451 |  |
| Funds at Lloyd's |  | 1,307,945 |  |  | 1,192,717 |  |
| Collateral in Trust for third party agreements |  | 1,510,416 |  |  | 2,085,443 |  |
| Securities on deposit with regulatory authorities |  | 64,360 |  |  | 53,925 |  |
| Total restricted investments |  | $ | 5,474,294 |  |  | $ | 7,028,716 |  |

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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27340-111563 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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