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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | $ 5,494 | $ 17,383 |
Long-term debt | 989,623 | 948,663 |
Senior notes, fair value | 1,018,200 | 964,800 |
Net unrealized gains (losses) included in net investment income | 24,737 | 11,542 | $ (13,549)
Other Investments | Net investment income |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) included in net investment income | 24,700 | 11,500 | 10,400
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 | $ (400)
Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Long-term debt | 989,623 | 948,663 |
Senior notes, fair value | 1,018,235 | $ 964,800 |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Assets, fair value | 850 |  |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities, fair value | $ 3,802 |  |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.90% |  |
Weighted average credit quality |  | 1.40% |
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.10% |  |
Weighted average credit quality |  | 2.00% |
Municipal |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.20% |  |
Weighted average credit quality |  | 2.40% |
Non-U.S. government (Sovereign debt) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.00% |  |
Weighted average credit quality |  | 1.60% |
Non-U.S. government-backed corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.30% |  |
Weighted average credit quality |  | 1.50% |
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.80% |  |
Weighted average credit quality |  | 3.70% |
Agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.00% |  |
Weighted average credit quality |  | 2.90% |
Weighted average life | 6 years 4 months 24 days | 6 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 | 3.70% |  |
Weighted average credit quality |  | 4.30% |
Weighted average life | 5 years 1 month 6 days | 5 years 1 month 6 days |
AltA non-agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.70% |  |
Weighted average credit quality |  | 5.20% |
Weighted average life | 6 years 2 months 12 days | 6 years |
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.90% |  |
Weighted average credit quality |  | 2.60% |
Weighted average life | 4 years 6 months | 3 years 10 months 24 days |
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.80% |  |
Weighted average credit quality |  | 2.30% |
Weighted average life | 3 years | 2 years 7 months 6 days |
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.40% |  |
Weighted average credit quality |  | 0.70% |
Restricted Stock Units (RSUs) | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | $ 11,000 |  |
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 |  |
Senior secured bank loan funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investment in closed end fund | $ 17,600 |  |
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 |  |
Hedge funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Hedge fund side pocket investments | $ 500 |  |

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