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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis | Below is a summary of the assets and liabilities that are measured at fair value on a recurring basis and also represents the carrying amount on the Company’s consolidated balance sheets:
| At March 31, 2018 | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
| Fixed maturity investments |  |  |  |  |  |  |  |
| U.S. treasuries | $ | 2,834,487 |  |  | $ | 2,834,487 |  |  | $ | — |  |  | $ | — |  |
| Agencies | 45,365 |  |  | — |  |  | 45,365 |  |  | — |  |
| Municipal | 506,470 |  |  | — |  |  | 506,470 |  |  | — |  |
| Non-U.S. government (Sovereign debt) | 303,056 |  |  | — |  |  | 303,056 |  |  | — |  |
| Non-U.S. government-backed corporate | 191,202 |  |  | — |  |  | 191,202 |  |  | — |  |
| Corporate | 2,147,578 |  |  | — |  |  | 2,147,578 |  |  | — |  |
| Agency mortgage-backed | 693,377 |  |  | — |  |  | 693,377 |  |  | — |  |
| Non-agency mortgage-backed | 302,638 |  |  | — |  |  | 302,638 |  |  | — |  |
| Commercial mortgage-backed | 197,126 |  |  | — |  |  | 197,126 |  |  | — |  |
| Asset-backed | 183,462 |  |  | — |  |  | 183,462 |  |  | — |  |
| Total fixed maturity investments | 7,404,761 |  |  | 2,834,487 |  |  | 4,570,274 |  |  | — |  |
| Short term investments | 1,616,597 |  |  | — |  |  | 1,616,597 |  |  | — |  |
| Equity investments trading | 387,462 |  |  | 387,462 |  |  | — |  |  | — |  |
| Other investments |  |  |  |  |  |  |  |
| Catastrophe bonds | 476,534 |  |  | — |  |  | 476,534 |  |  | — |  |
| Private equity partnerships (1) | 190,067 |  |  | — |  |  | — |  |  | — |  |
| Senior secured bank loan funds (1) | 13,771 |  |  | — |  |  | — |  |  | — |  |
| Hedge funds (1) | 12,280 |  |  | — |  |  | — |  |  | — |  |
| Total other investments | 692,652 |  |  | — |  |  | 476,534 |  |  | — |  |
| Other assets and (liabilities) |  |  |  |  |  |  |  |
| Assumed and ceded (re)insurance contracts (2) | (2,780 | ) |  | — |  |  | — |  |  | (2,780 | ) |
| Derivatives (3) | 7,514 |  |  | (229 | ) |  | 7,743 |  |  | — |  |
| Total other assets and (liabilities) | 4,734 |  |  | (229 | ) |  | 7,743 |  |  | (2,780 | ) |
|  | $ | 10,106,206 |  |  | $ | 3,221,720 |  |  | $ | 6,671,148 |  |  | $ | (2,780 | ) |
(1) | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
(2) | Included in assumed and ceded (re)insurance contracts at March 31, 2018 was $2.5 million and $5.3 million of other assets and other liabilities, respectively.
(3) | See “Note 13. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
| At December 31, 2017 | Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
| Fixed maturity investments |  |  |  |  |  |  |  |
| U.S. treasuries | $ | 3,168,763 |  |  | $ | 3,168,763 |  |  | $ | — |  |  | $ | — |  |
| Agencies | 47,646 |  |  | — |  |  | 47,646 |  |  | — |  |
| Municipal | 509,802 |  |  | — |  |  | 509,802 |  |  | — |  |
| Non-U.S. government (Sovereign debt) | 287,660 |  |  | — |  |  | 287,660 |  |  | — |  |
| Non-U.S. government-backed corporate | 163,651 |  |  | — |  |  | 163,651 |  |  | — |  |
| Corporate | 2,063,459 |  |  | — |  |  | 2,063,459 |  |  | — |  |
| Agency mortgage-backed | 500,456 |  |  | — |  |  | 500,456 |  |  | — |  |
| Non-agency mortgage-backed | 300,331 |  |  | — |  |  | 300,331 |  |  | — |  |
| Commercial mortgage-backed | 202,062 |  |  | — |  |  | 202,062 |  |  | — |  |
| Asset-backed | 182,725 |  |  | — |  |  | 182,725 |  |  | — |  |
| Total fixed maturity investments | 7,426,555 |  |  | 3,168,763 |  |  | 4,257,792 |  |  | — |  |
| Short term investments | 991,863 |  |  | — |  |  | 991,863 |  |  | — |  |
| Equity investments trading | 388,254 |  |  | 388,254 |  |  | — |  |  | — |  |
| Other investments |  |  |  |  |  |  |  |
| Catastrophe bonds | 380,475 |  |  | — |  |  | 380,475 |  |  | — |  |
| Private equity partnerships (1) | 196,220 |  |  | — |  |  | — |  |  | — |  |
| Senior secured bank loan funds (1) | 17,574 |  |  | — |  |  | — |  |  | — |  |
| Hedge funds (1) | 524 |  |  | — |  |  | — |  |  | — |  |
| Total other investments | 594,793 |  |  | — |  |  | 380,475 |  |  | — |  |
| Other assets and (liabilities) |  |  |  |  |  |  |  |
| Assumed and ceded (re)insurance contracts (2) | (2,952 | ) |  | — |  |  | — |  |  | (2,952 | ) |
| Derivatives (3) | 4,636 |  |  | (45 | ) |  | 4,681 |  |  | — |  |
| Total other assets and (liabilities) | 1,684 |  |  | (45 | ) |  | 4,681 |  |  | (2,952 | ) |
|  | $ | 9,403,149 |  |  | $ | 3,556,972 |  |  | $ | 5,634,811 |  |  | $ | (2,952 | ) |
(1) | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
(2) | Included in assumed and ceded (re)insurance contracts at December 31, 2017 was $2.5 million and $5.5 million of other assets and other liabilities, respectively.
(3) | See “Note 13. Derivative Instruments” for additional information related to the fair value by type of contract, of derivatives entered into by the Company.
Schedule Of Quantitative Information Used As Level 3 Inputs | Below is a summary of quantitative information regarding the significant observable and unobservable inputs (Level 3) used in determining the fair value of assets and liabilities measured at fair value on a recurring basis:
| At March 31, 2018 | Fair Value (Level 3) |  | Valuation Technique |  | Unobservable (U) and Observable (O) Inputs |  | Low |  | High |  | Weighted Average or Actual |
| Other assets and (liabilities) |  |  |  |  |  |  |  |  |  |  |  |
| Assumed and ceded (re)insurance contracts | $ | 893 |  |  | Internal valuation model |  | Bond price (O) |  | $ | 101.46 |  |  | $ | 112.05 |  |  | $ | 107.31 |  |
|  |  |  |  |  | Liquidity discount (U) |  | n/a |  |  | n/a |  |  | 1.3 | % |
| Assumed and ceded (re)insurance contracts | (3,673 | ) |  | Internal valuation model |  | Net undiscounted cash flows (U) |  | n/a |  |  | n/a |  |  | $ | (4,706 | ) |
|  |  |  |  |  | Expected loss ratio (U) |  | n/a |  |  | n/a |  |  | 20.4 | % |
|  |  |  |  |  | Net acquisition expense ratio (O) |  | n/a |  |  | n/a |  |  | 13.7 | % |
|  |  |  |  |  | Contract period (O) |  | 2.0 years |  |  | 4.7 years |  |  | 4.1 years |  |
|  |  |  |  |  | Discount rate (U) |  | n/a |  |  | n/a |  |  | 2.4 | % |
| Total other assets and (liabilities) | $ | (2,780 | ) |  |  |  |  |  |  |  |  |  |  |
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs | Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation.
|  | Other assets and (liabilities) |
| Balance - January 1, 2018 | $ | (2,952 | ) |
| Total realized and unrealized gains |  |
| Included in other (loss) income | 206 |  |
| Purchases | (34 | ) |
| Balance - March 31, 2018 | $ | (2,780 | ) |
|  | Other assets and (liabilities) |
| Balance - January 1, 2017 | $ | (13,004 | ) |
| Total realized and unrealized gains |  |
| Included in other (losses) income | 1,071 |  |
| Purchases | (202 | ) |
| Balance - March 31, 2017 | $ | (12,135 | ) |
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Level 3 Inputs | Below is a reconciliation of the beginning and ending balances, for the periods shown, of assets and liabilities measured at fair value on a recurring basis using Level 3 inputs. Interest and dividend income are included in net investment income and are excluded from the reconciliation.
|  | Other assets and (liabilities) |
| Balance - January 1, 2018 | $ | (2,952 | ) |
| Total realized and unrealized gains |  |
| Included in other (loss) income | 206 |  |
| Purchases | (34 | ) |
| Balance - March 31, 2018 | $ | (2,780 | ) |
|  | Other assets and (liabilities) |
| Balance - January 1, 2017 | $ | (13,004 | ) |
| Total realized and unrealized gains |  |
| Included in other (losses) income | 1,071 |  |
| Purchases | (202 | ) |
| Balance - March 31, 2017 | $ | (12,135 | ) |
Schedule Of Balances Elected To Account For At Fair Value | Below is a summary of the balances the Company has elected to account for at fair value:
|  | March 31, 2018 |  | December 31, 2017 |
| Other investments | $ | 692,652 |  |  | $ | 594,793 |  |
| Other assets | $ | 2,533 |  |  | $ | 2,542 |  |
| Other liabilities | $ | 5,313 |  |  | $ | 5,494 |  |
Schedule Of Other Investments Measured Using Net Asset Valuations | The table below shows the Company’s portfolio of other investments measured using net asset valuations as a practical expedient:
| At March 31, 2018 | Fair Value |  | Unfunded Commitments |  | Redemption Frequency |  | Redemption Notice Period (Minimum Days) |  | Redemption Notice Period (Maximum Days) |
| Private equity partnerships | $ | 190,067 |  |  | $ | 416,135 |  |  | See below |  | See below |  | See below |
| Senior secured bank loan funds | 13,771 |  |  | 25,297 |  |  | See below |  | See below |  | See below |
| Hedge funds | 12,280 |  |  | — |  |  | See below |  | See below |  | See below |
| Total other investments measured using net asset valuations | $ | 216,118 |  |  | $ | 441,432 |  |  |  |  |  |  |  |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14217-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (c)(2),(d),(e) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a),(c)(1),(d)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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