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v3.7.0.1

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | $ 15,258 |  | $ 15,258 |  | $ 17,383
Debt | 988,866 |  | 988,866 |  | 948,663
Debt, fair value | 1,021,300 |  | 1,021,300 |  | 964,800
Net unrealized gains (losses) recognized in earnings |  |  | 12,491 | $ (20,360) |
Net investment income | Other Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains (losses) recognized in earnings | 5,600 | $ (5,800) | 12,500 | $ (3,200) |
Other income (loss) | Other assets and (liabilities) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains (losses) recognized in earnings | 0 | $ 0 | 0 |  | $ 0
Significant Unobservable Inputs (Level 3) | Internal Valuation Model |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liabilities, fair value | 9,502 |  | 9,502 |  |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Assets, fair value | 809 |  | 809 |  |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contract | Internal Valuation Model |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liabilities, fair value | $ 10,311 |  | $ 10,311 |  |
U.S. treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.50% |  | 1.50% |  | 1.40%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.00% |  | 2.00% |  | 2.00%
Municipal |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.90% |  | 1.90% |  | 2.40%
Non-U.S. government (Sovereign debt) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.70% |  | 1.70% |  | 1.60%
Non-U.S. government-backed corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.80% |  | 1.80% |  | 1.50%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.60% |  | 3.60% |  | 3.70%
Agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.00% |  | 3.00% |  | 2.90%
Weighted average life |  |  | 6 years 7 months 6 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 | 4.00% |  | 4.00% |  | 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 | 4.40% |  | 4.40% |  | 5.20%
Weighted average life |  |  | 6 years 1 month 6 days |  | 6 years
Commercial mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.80% |  | 2.80% |  | 2.60%
Weighted average life |  |  | 4 years 9 months 18 days |  | 3 years 10 months 24 days
Asset-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.50% |  | 2.50% |  | 2.30%
Weighted average life |  |  | 2 years 8 months 12 days |  | 2 years 7 months 6 days
Short term investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.10% |  | 1.10% |  | 0.70%
Restricted stock units | Significant Other Observable Inputs (Level 2) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | $ 5,400 |  | $ 5,400 |  |
Private equity partnerships | Minimum |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Liquidation period for fund assets |  |  | 7 years |  |
Private equity partnerships | High |  |  |  |  |
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 | 17,300 |  | $ 17,300 |  |
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 | High |  |  |  |  |
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 | $ 1,200 |  | $ 1,200 |  |

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