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Fair Value Measurements (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | $ 784,933,000 | $ 594,793,000 |  |
Other assets | 4,968,000 | 2,542,000 |  |
Other liabilities | (13,327,000) | (5,494,000) |  |
Long-term debt | 991,127,000 | 989,623,000 |  |
Senior notes, fair value | 974,700,000 | 1,000,000,000 |  |
Net unrealized gains (losses) included in net investment income | (8,309,000) | 24,737,000 | $ 11,542,000 |
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 784,933,000 | 594,793,000 |  |
Other assets | 4,040,000 | 1,684,000 |  |
Other investments | Net investment income |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Net unrealized gains (losses) included in net investment income | (8,300,000) | 24,700,000 | 11,500,000 |
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 |
Senior Notes |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Long-term debt | 991,127,000 | 989,623,000 |  |
Senior notes, fair value | 974,714,000 | 1,018,235,000 |  |
Private equity investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 242,647,000 | 196,220,000 |  |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 516,571,000 | 380,475,000 |  |
Other assets | 11,915,000 | 4,681,000 |  |
Significant Other Observable Inputs (Level 2) | Private equity investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 0 | 0 |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 54,545,000 | 0 |  |
Other liabilities | (8,359,000) | (2,952,000) |  |
Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments |  |  |  | $ 54,545,000
Other assets | 46,186,000 |  |  |
Significant Unobservable Inputs (Level 3) | Private equity investments | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 54,545,000 | $ 0 |  |
Significant Unobservable Inputs (Level 3) | Private equity investments | Internal Valuation Model Valuation Technique | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments |  |  |  | $ 54,545,000
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other assets | 550,000 |  |  |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other liabilities | (8,909,000) |  |  |
Fair Value Measured at Net Asset Value Per Share |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments fair value | $ 213,817,000 |  |  |
U.S. treasuries |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 2.50% |  |  |
Weighted average credit quality |  | 1.90% |  |
Agencies |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 3.00% |  |  |
Weighted average credit quality |  | 2.10% |  |
Municipal |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 4.80% |  |  |
Weighted average credit quality |  | 2.20% |  |
Non-U.S. government |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 2.70% |  |  |
Weighted average credit quality |  | 2.00% |  |
Non-U.S. government-backed corporate |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 2.80% |  |  |
Weighted average credit quality |  | 2.30% |  |
Corporate |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 4.90% |  |  |
Weighted average credit quality |  | 3.80% |  |
Agency mortgage-backed |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 3.50% |  |  |
Weighted average credit quality |  | 3.00% |  |
Weighted average life | 7 years 1 month 6 days | 6 years 4 months 24 days |  |
Non-agency prime residential mortgage-backed |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 4.40% |  |  |
Weighted average credit quality |  | 3.70% |  |
Weighted average life | 4 years 8 months 12 days | 5 years 1 month 6 days |  |
Alt-A non-agency mortgage-backed |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 4.70% |  |  |
Weighted average credit quality |  | 3.70% |  |
Weighted average life | 6 years 3 months 18 days | 6 years 2 months 12 days |  |
Commercial mortgage-backed |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 3.60% |  |  |
Weighted average credit quality |  | 2.90% |  |
Weighted average life | 5 years | 4 years 6 months |  |
Asset-backed |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 4.30% |  |  |
Weighted average credit quality |  | 2.80% |  |
Weighted average life | 3 years 2 months 12 days | 3 years |  |
Short term investments |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Weighted average yield to maturity | 2.10% |  |  |
Weighted average credit quality |  | 1.40% |  |
Private equity investments |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | $ 242,647,000 | $ 196,220,000 |  |
Private equity investments | Minimum |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Liquidating period | 7 years |  |  |
Private equity investments | Maximum |  |  |  |
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 | $ 188,102,000 |  |  |
Senior secured bank loan funds |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 14,482,000 | 17,574,000 |  |
Investment in closed end fund | $ 14,500,000 |  |  |
Senior secured bank loan funds | Minimum |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Liquidating period | 4 years |  |  |
Senior secured bank loan funds | Maximum |  |  |  |
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 | $ 14,482,000 |  |  |
Hedge funds |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Other investments | 11,233,000 | $ 524,000 |  |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments fair value | 11,233,000 |  |  |
Hedge Funds Redeemable at Option of Shareholder | Fair Value Measured at Net Asset Value Per Share |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments fair value | $ 11,000,000 |  |  |

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