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Investments | 3 Months Ended
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Mar. 31, 2021
Investments [Abstract] |
Investments | INVESTMENTS Fixed Maturity Investments Trading The following table summarizes the fair value of fixed maturity investments trading:
|  | March 31, 2021 |  | December 31, 2020 |
| U.S. treasuries | $ | 5,107,878 |  |  | $ | 4,960,409 |  |
| Agencies | 227,184 |  |  | 368,032 |  |
| Non-U.S. government | 518,162 |  |  | 491,531 |  |
| Non-U.S. government-backed corporate | 335,662 |  |  | 338,014 |  |
| Corporate | 4,289,072 |  |  | 4,261,025 |  |
| Agency mortgage-backed | 957,563 |  |  | 1,113,792 |  |
| Non-agency mortgage-backed | 272,529 |  |  | 291,444 |  |
| Commercial mortgage-backed | 713,044 |  |  | 791,272 |  |
| Asset-backed | 888,140 |  |  | 890,984 |  |
| Total fixed maturity investments trading | $ | 13,309,234 |  |  | $ | 13,506,503 |  |
Contractual maturities of fixed maturity investments trading are described in the following table. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
| March 31, 2021 | Amortized Cost |  | Fair Value |  |  |  |  |  |  |  |  |
| Due in less than one year | $ | 568,444 |  |  | $ | 572,443 |  |  |  |  |  |  |  |  |  |
| Due after one through five years | 5,498,414 |  |  | 5,569,638 |  |  |  |  |  |  |  |  |  |
| Due after five through ten years | 3,822,345 |  |  | 3,786,423 |  |  |  |  |  |  |  |  |  |
| Due after ten years | 562,618 |  |  | 549,453 |  |  |  |  |  |  |  |  |  |
| Mortgage-backed | 1,922,325 |  |  | 1,943,137 |  |  |  |  |  |  |  |  |  |
| Asset-backed | 884,839 |  |  | 888,140 |  |  |  |  |  |  |  |  |  |
| Total | $ | 13,258,985 |  |  | $ | 13,309,234 |  |  |  |  |  |  |  |  |  |
Equity Investments Trading The following table summarizes the fair value of equity investments trading:
|  | March 31, 2021 |  | December 31, 2020 |
| Financials | $ | 241,360 |  |  | $ | 452,765 |  |
| Communications and technology | 123,204 |  |  | 119,592 |  |
| Consumer | 45,586 |  |  | 44,477 |  |
| Industrial, utilities and energy | 48,935 |  |  | 43,380 |  |
| Healthcare | 36,248 |  |  | 35,140 |  |
| Basic materials | 7,804 |  |  | 7,263 |  |
| Total | $ | 503,137 |  |  | $ | 702,617 |  |
Pledged Investments At March 31, 2021, $8.4 billion of cash and investments at fair value were on deposit with, or in trust accounts for the benefit of, various counterparties, including with respect to the Company’s letter of credit facilities (December 31, 2020 - $8.1 billion). Of this amount, $2.5 billion is on deposit with, or in trust accounts for the benefit of, U.S. state regulatory authorities (December 31, 2020 - $2.5 billion). Reverse Repurchase Agreements At March 31, 2021, the Company held $25.0 million (December 31, 2020 - $126.5 million) of reverse repurchase agreements. These loans are fully collateralized, are generally outstanding for a short period of time and are presented on a gross basis as part of short term investments on the Company’s consolidated balance sheets. The required collateral for these loans typically includes high-quality, readily marketable instruments at a minimum amount of 102% of the loan principal. Upon maturity, the Company receives principal and interest income. Net Investment Income The components of net investment income are as follows:
|  |  |  | Three months ended |
|  |  |  |  |  | March 31, 2021 |  | March 31, 2020 |
| Fixed maturity investments |  |  |  |  | $ | 62,933 |  |  | $ | 73,338 |  |
| Short term investments |  |  |  |  | 573 |  |  | 12,092 |  |
| Equity investments |  |  |  |  | 1,491 |  |  | 1,551 |  |
| Other investments |  |  |  |  |  |  |  |
| Catastrophe bonds |  |  |  |  | 14,468 |  |  | 14,139 |  |
| Other |  |  |  |  | 3,801 |  |  | 1,629 |  |
| Cash and cash equivalents |  |  |  |  | 102 |  |  | 1,504 |  |
|  |  |  |  |  | 83,368 |  |  | 104,253 |  |
| Investment expenses |  |  |  |  | (3,564) |  |  | (4,780) |  |
| Net investment income |  |  |  |  | $ | 79,804 |  |  | $ | 99,473 |  |
Net Realized and Unrealized Losses on Investments Net realized and unrealized losses on investments are as follows:
|  |  |  | Three months ended |
|  |  |  |  |  | March 31, 2021 |  | March 31, 2020 |
| Net realized gains on fixed maturity investments trading |  |  |  |  | $ | 20,398 |  |  | $ | 57,487 |  |
| Net unrealized losses on fixed maturity investments trading |  |  |  |  | (297,018) |  |  | (20,345) |  |
| Net realized and unrealized (losses) gains on fixed maturity investments trading |  |  |  |  | (276,620) |  |  | 37,142 |  |
| Net realized and unrealized gains on investments-related derivatives |  |  |  |  | 14,861 |  |  | 33,181 |  |
| Net realized gains (losses) on equity investments trading |  |  |  |  | 109,887 |  |  | (15,047) |  |
| Net unrealized losses on equity investments trading |  |  |  |  | (177,809) |  |  | (105,937) |  |
| Net realized and unrealized losses on equity investments trading |  |  |  |  | (67,922) |  |  | (120,984) |  |
| Net realized and unrealized losses on other investments - catastrophe bonds |  |  |  |  | (19,083) |  |  | (14,352) |  |
| Net realized and unrealized gains (losses) on other investments - other |  |  |  |  | 3,201 |  |  | (45,694) |  |
| Net realized and unrealized losses on investments |  |  |  |  | $ | (345,563) |  |  | $ | (110,707) |  |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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