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v3.19.3.a.u2

Fair Value Measurements (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed maturity investments | $ 11,171,655,000 | $ 8,088,870,000 |
Other investments | 1,087,377,000 | 784,933,000 |
Other assets | 32,944,000 | 4,968,000 |
Other liabilities | (28,213,000) | (13,327,000) |
Carrying Value | 1,384,105,000 | 991,127,000 |
Fair Value | 1,468,618,000 | 974,714,000 |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed maturity investments | 11,171,655,000 | 8,088,870,000 |
Other investments | 1,087,377,000 | 784,933,000 |
Other assets | 21,668,000 | 4,040,000 |
Other investments | Net investment income |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) included in net investment income | 12,200,000 | (8,300,000) | $ 24,700,000
Other assets and (liabilities) | Other income (loss) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) included in net investment income | 0 | 0 | $ 0
Municipal | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed maturity investments | 0 | 6,854,000 |
Private equity investments | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 271,047,000 | 242,647,000 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed maturity investments | 0 | 0 |
Other investments | 74,634,000 | 54,545,000 |
Other assets | 4,731,000 |  |
Other liabilities |  | (8,359,000) |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 74,634,000 |  |
Significant Unobservable Inputs (Level 3) | Municipal | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed maturity investments |  | 0 |
Significant Unobservable Inputs (Level 3) | Private equity investments | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 74,634,000 | $ 54,545,000 |
Significant Unobservable Inputs (Level 3) | Private equity investments | External valuation model | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 10,327,000 |  |
Significant Unobservable Inputs (Level 3) | Private equity investments | Internal valuation model | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 64,307,000 |  |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal valuation model | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other assets | 500,000 |  |
Other liabilities | (8,767,000) |  |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal valuation model | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other assets | 12,997,000 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments fair value | $ 231,102,000 |  |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 1.70% |  |
Weighted average credit quality |  | 2.50% |
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 2.10% |  |
Weighted average credit quality |  | 3.00% |
Municipal |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average credit quality |  | 4.80% |
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 1.60% |  |
Weighted average credit quality |  | 2.70% |
Non-U.S. government-backed corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 2.00% |  |
Weighted average credit quality |  | 2.80% |
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 3.00% |  |
Weighted average credit quality |  | 4.90% |
Agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 2.50% |  |
Weighted average credit quality |  | 3.50% |
Weighted average life | 4 years 10 months 24 days | 7 years 1 month 6 days |
Non-agency prime residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 3.30% |  |
Weighted average credit quality |  | 4.40% |
Weighted average life | 4 years 9 months 18 days | 4 years 8 months 12 days |
Alt-A non-agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 3.80% |  |
Weighted average credit quality |  | 4.70% |
Weighted average life | 6 years 3 months 18 days | 6 years 3 months 18 days |
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 2.60% |  |
Weighted average credit quality |  | 3.60% |
Weighted average life | 5 years 8 months 12 days | 5 years |
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 3.30% |  |
Weighted average credit quality |  | 4.30% |
Weighted average life | 3 years 2 months 12 days | 3 years 2 months 12 days |
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 1.60% |  |
Weighted average credit quality |  | 2.10% |
Private equity investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 271,047,000 | $ 242,647,000 |
Private equity investments | Low |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 7 years |  |
Private equity investments | High |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 10 years |  |
Private equity investments | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments fair value | $ 196,413,000 |  |
Senior secured bank loan funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 22,598,000 | 14,482,000 |
Investments fair value | $ 22,600,000 |  |
Senior secured bank loan funds | Low |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 4 years |  |
Senior secured bank loan funds | High |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 5 years |  |
Senior secured bank loan funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments fair value | $ 22,598,000 |  |
Hedge funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 12,091,000 | $ 11,233,000 |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments fair value | $ 12,091,000 |  |

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