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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 1,379,056 |  | $ 1,256,948
Other liabilities | 12,858 |  | 15,193
Other assets | 6,437 |  | 8,982
Debt | 1,136,783 |  | 1,136,265
Long-term debt, fair value | 1,231,249 |  | 1,261,069
Net investment income | Other investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains recognized in earnings | 3,200 | $ (4,700) |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 1,379,056 |  | 1,256,948
Other liabilities | 12,436 |  |
Other assets |  |  | 16,662
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 75,874 |  | 79,807
Other liabilities | 6,421 |  | 6,211
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 75,874 |  | 79,807
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | 168 |  | 190
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | 6,849 |  | 7,395
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 | 75,874 |  | 79,807
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other assets | 596 |  | $ 1,374
Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 361,578 |  |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 0.70% |  | 0.40%
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.40% |  | 0.90%
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.00% |  | 0.50%
Non-U.S. government-backed corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.20% |  | 1.00%
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.50% |  | 2.20%
Agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.70% |  | 1.00%
Weighted average life | 4 years 10 months 24 days |  | 3 years 9 months 18 days
Non-agency prime residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.00% |  | 3.00%
Weighted average life | 5 years 3 months 18 days |  | 5 years 2 months 12 days
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.80% |  | 1.50%
Weighted average life | 4 years 8 months 12 days |  | 5 years
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.70% |  | 1.80%
Weighted average life | 3 years 1 month 6 days |  | 3 years 2 months 12 days
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 0.10% |  | 0.10%
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 | $ 333,910 |  |
Senior secured bank loan funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 16,900 |  |
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 | $ 16,886 |  |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Miscellaneous other investments | $ 10,782 |  |

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