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v3.5.0.2

Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | $ (17,816,000) |  | $ (17,816,000) |  | $ (9,362,000)
Debt | 951,620,000 |  | 951,620,000 |  | 960,495,000
Debt, fair value | 1,000,000,000 |  | 1,000,000,000 |  | $ 973,300,000
Net unrealized gains (losses) recognized in earnings |  |  | (17,608,000) | $ (10,690,000) |
Other Investments | Net investment income |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains (losses) recognized in earnings | 2,800,000 | $ (13,900,000) | 17,600,000 | (10,700,000) |
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 | $ (100,000) | 0 | $ (400,000) |
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Assets, fair value | 12,012,000 |  | 12,012,000 |  |
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 | (677,000) |  | $ (677,000) |  |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Weighted Average or Actual | Internal Valuation Model Valuation Technique |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidity discount |  |  | 1.30% |  |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contract | Internal Valuation Model Valuation Technique |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liabilities, fair value | $ (11,335,000) |  | $ (11,335,000) |  |
U.S. treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.90% |  | 0.90% |  | 1.30%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.30% |  | 1.30% |  | 1.70%
Municipal |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.70% |  | 1.70% |  | 2.00%
Non-U.S. government (Sovereign Debt) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.10% |  | 1.10% |  | 1.40%
Non-U.S. government-backed corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.00% |  | 1.00% |  | 1.30%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.50% |  | 3.50% |  | 3.80%
Agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.10% |  | 2.10% |  | 2.70%
Weighted average life |  |  | 5 years |  | 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 | 4.20% |  | 4.20% |  | 3.80%
Weighted average life |  |  | 4 years 6 months |  | 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 | 5.00% |  | 5.00% |  | 4.70%
Weighted average life |  |  | 5 years 10 months 24 days |  | 5 years 4 months 24 days
Commercial mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.30% |  | 2.30% |  | 2.90%
Weighted average life |  |  | 3 years 8 months 12 days |  | 3 years 8 months 12 days
Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.10% |  | 2.10% |  | 2.10%
Weighted average life |  |  | 2 years 9 months 18 days |  | 2 years 6 months
Short term investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 0.50% |  | 0.50% |  | 0.40%
Restricted stock units | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | $ (8,200,000) |  | $ (8,200,000) |  |
Private equity partnerships | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 7 years |  |
Private equity partnerships | Maximum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 10 years |  |
Senior secured bank loan funds |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investment in closed end fund | 19,400,000 |  | $ 19,400,000 |  |
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 |  |
Hedge funds |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Hedge fund side pocket investments | $ 1,600,000 |  | $ 1,600,000 |  |

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