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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | $ 17,383 | $ 9,362 |
Long-term debt | 948,663 | 960,495 |
Senior Notes, fair value | 964,800 | 973,342 |
Net unrealized gains (losses) recognized in earnings | 11,542 | (13,549) | $ (1,393)
Other Investments | Net investment income |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) recognized in earnings | 11,500 | 10,400 | 17,700
Other assets and (liabilities) | Other income (loss) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) recognized in earnings | 0 | $ (400) | $ 0
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liabilities, fair value | 574 |  |
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 | $ 12,430 |  |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.40% | 1.30% |
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.00% | 1.70% |
Municipal |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.40% | 2.00% |
Non-U.S. government (Sovereign Debt) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.60% | 1.40% |
Non-U.S. government-backed corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 1.50% | 1.30% |
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 3.70% | 3.80% |
Agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.90% | 2.70% |
Weighted average life | 6 years 10 months 24 days | 6 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 | 4.30% | 3.80% |
Weighted average life | 5 years 1 month 6 days | 4 years 3 months 18 days |
AltA non-agency mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.20% | 4.70% |
Weighted average life | 6 years | 5 years 4 months 24 days |
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.60% | 2.90% |
Weighted average life | 3 years 10 months 24 days | 3 years 8 months 12 days |
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 2.30% | 2.10% |
Weighted average life | 2 years 7 months 6 days | 2 years 6 months |
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 0.70% | 0.40% |
Restricted Stock Units (RSUs) | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | $ 13,100 |  |
Private equity partnerships | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 7 years |  |
Private equity partnerships | 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 | $ 22,000 |  |
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 |  |
Hedge funds |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Hedge fund side pocket investments | $ 1,500 |  |

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