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v3.19.3

Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | $ 962,109,000 |  | $ 962,109,000 |  | $ 784,933,000
Other assets | 37,820,000 |  | 37,820,000 |  | 4,968,000
Other liabilities | 31,601,000 |  | 31,601,000 |  | 13,327,000
Debt | 1,383,498,000 |  | 1,383,498,000 |  | 991,127,000
Long-term debt, fair value | 1,460,184,000 |  | 1,460,184,000 |  | 974,714,000
Net unrealized gains recognized in earnings |  |  | 7,284,000 | $ 17,778,000 |
Net investment income | Other investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains recognized in earnings | 5,100,000 | $ 9,100,000 | 7,300,000 | 17,800,000 |
Other income (loss) | Other assets and (liabilities) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains recognized in earnings | 0 | $ 0 | 0 | $ 0 |
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 962,109,000 |  | 962,109,000 |  | 784,933,000
Other assets | 24,784,000 |  | 24,784,000 |  | 4,040,000
Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 266,048,000 |  | 266,048,000 |  | 242,647,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 74,210,000 |  | 74,210,000 |  | 54,545,000
Other assets | 6,219,000 |  | 6,219,000 |  |
Other liabilities |  |  |  |  | 8,359,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 74,210,000 |  | 74,210,000 |  | $ 54,545,000
Significant Unobservable Inputs (Level 3) | External valuation model | Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 10,455,000 |  | 10,455,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 63,755,000 |  | 63,755,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed reinsurance contract |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets | 500,000 |  | 500,000 |  |
Other liabilities | 9,242,000 |  | 9,242,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contract |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets | 14,977,000 |  | 14,977,000 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | $ 228,433,000 |  | $ 228,433,000 |  |
U.S. treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.70% |  | 1.70% |  | 2.50%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.00% |  | 2.00% |  | 3.00%
Municipal |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.00% |  | 3.00% |  | 4.80%
Non-U.S. government |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.70% |  | 1.70% |  | 2.70%
Non-U.S. government-backed corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.00% |  | 2.00% |  | 2.80%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.00% |  | 3.00% |  | 4.90%
Agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.50% |  | 2.50% |  | 3.50%
Weighted average life |  |  | 4 years 8 months 12 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 effective yield | 3.30% |  | 3.30% |  | 4.40%
Weighted average life |  |  | 4 years 8 months 12 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 effective yield | 3.70% |  | 3.70% |  | 4.70%
Weighted average life |  |  | 6 years 7 months 6 days | 6 years 3 months 18 days |
Commercial mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.50% |  | 2.50% |  | 3.60%
Weighted average life |  |  | 5 years 7 months 6 days | 5 years |
Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.40% |  | 3.40% |  | 4.30%
Weighted average life |  |  | 3 years 3 months 18 days | 3 years 2 months 12 days |
Short term investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.70% |  | 1.70% |  | 2.10%
Private equity investments | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 7 years |  |
Private equity investments | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 10 years |  |
Private equity investments | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | $ 191,838,000 |  | $ 191,838,000 |  |
Senior secured bank loan funds |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | 24,600,000 |  | $ 24,600,000 |  |
Senior secured bank loan funds | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 4 years |  |
Senior secured bank loan funds | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 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] |  |  |  |  |
Miscellaneous other investments | 24,567,000 |  | $ 24,567,000 |  |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | $ 12,028,000 |  | $ 12,028,000 |  |

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