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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | $ 1,093,338,000 |  | $ 1,093,338,000 |  | $ 1,087,377,000
Other assets | 12,537,000 |  | 12,537,000 |  | 32,944,000
Other liabilities | 19,248,000 |  | 19,248,000 |  | 28,213,000
Debt | 1,135,216,000 |  | 1,135,216,000 |  | 1,384,105,000
Long-term debt, fair value | 1,234,253,000 |  | 1,234,253,000 |  | 1,468,618,000
Net investment income | Other investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains recognized in earnings | 15,600,000 | $ (2,700,000) | (44,500,000) | $ (1,400,000) |
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 | 1,093,338,000 |  | 1,093,338,000 |  | 1,087,377,000
Other assets |  |  |  |  | 21,668,000
Other liabilities | 2,636,000 |  | 2,636,000 |  |
Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 254,257,000 |  | 254,257,000 |  | 271,047,000
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets |  |  |  |  | 4,731,000
Other liabilities | 6,711,000 |  | 6,711,000 |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 71,450,000 |  | 71,450,000 |  | 74,634,000
Other assets |  |  |  |  | 4,731,000
Other liabilities | 6,711,000 |  | 6,711,000 |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other investments | 71,450,000 |  | 71,450,000 |  | 74,634,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets |  |  |  |  | $ 4,731,000
Other liabilities | 6,711,000 |  | 6,711,000 |  |
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 | 1,143,000 |  | 1,143,000 |  |
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 | 70,307,000 |  | 70,307,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | 1,400,000 |  | 1,400,000 |  |
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 liabilities | 8,232,000 |  | 8,232,000 |  |
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 | 2,963,000 |  | 2,963,000 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | $ 214,726,000 |  | $ 214,726,000 |  |
U.S. treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.30% |  | 0.30% |  | 1.70%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.70% |  | 0.70% |  | 2.10%
Non-U.S. government |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.70% |  | 0.70% |  | 1.60%
Non-U.S. government-backed corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.80% |  | 0.80% |  | 2.00%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.70% |  | 2.70% |  | 3.00%
Agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.00% |  | 1.00% |  | 2.50%
Weighted average life |  |  | 3 years 2 months 12 days |  | 4 years 10 months 24 days
Non-agency prime residential mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.10% |  | 3.10% |  | 3.30%
Weighted average life |  |  | 4 years 9 months 18 days |  | 4 years 9 months 18 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% |  | 3.80%
Weighted average life |  |  | 6 years 1 month 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 | 2.00% |  | 2.00% |  | 2.60%
Weighted average life |  |  | 5 years 6 months |  | 5 years 8 months 12 days
Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.50% |  | 2.50% |  | 3.30%
Weighted average life |  |  | 3 years |  | 3 years 2 months 12 days
Short term investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.20% |  | 0.20% |  | 1.60%
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 | $ 182,807,000 |  | $ 182,807,000 |  |
Senior secured bank loan funds |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | 22,300,000 |  | $ 22,300,000 |  |
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 | 22,261,000 |  | $ 22,261,000 |  |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Miscellaneous other investments | $ 9,658,000 |  | $ 9,658,000 |  |

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