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Fair Value Measurements (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets | $ 5,259,000 |  | $ 5,259,000 |  | $ 2,542,000
Other liabilities | 14,208,000 |  | 14,208,000 |  | 5,494,000
Debt | 990,749,000 |  | 990,749,000 |  | 989,623,000
Long-term debt, fair value | 980,300,000 |  | 980,300,000 |  | 1,018,200,000
Net unrealized gains recognized in earnings |  |  | 17,778,000 | $ 2,686,000 |
Net investment income | Other Investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains recognized in earnings | 9,100,000 | $ 9,800,000 | 17,800,000 | 2,700,000 |
Other income (loss) | Other assets and (liabilities) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Net unrealized gains recognized in earnings | 0 | $ 0 | 0 | $ 0 |
Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 990,749,000 |  | 990,749,000 |  | 989,623,000
Long-term debt, fair value | 980,318,000 |  | 980,318,000 |  | 1,018,235,000
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets |  |  |  |  | 1,684,000
Other liabilities | 7,355,000 |  | 7,355,000 |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | 8,949,000 |  | 8,949,000 |  | $ 2,952,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | 8,949,000 |  | 8,949,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed reinsurance contract |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other assets | 994,000 |  | 994,000 |  |
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contract |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Other liabilities | 9,943,000 |  | 9,943,000 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | $ 213,793,000 |  | $ 213,793,000 |  |
U.S. treasuries |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.80% |  | 2.80% |  | 1.90%
Agencies |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.10% |  | 3.10% |  | 2.10%
Municipal |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.00% |  | 4.00% |  | 2.20%
Non-U.S. government (Sovereign debt) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 2.90% |  | 2.90% |  | 2.00%
Non-U.S. government-backed corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.20% |  | 3.20% |  | 2.30%
Corporate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.30% |  | 4.30% |  | 3.80%
Agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 3.70% |  | 3.70% |  | 3.00%
Weighted average life |  |  | 8 years 2 months 12 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 effective yield | 4.20% |  | 4.20% |  | 3.70%
Weighted average life |  |  | 5 years 6 months |  | 5 years 1 month 6 days
Alt-A non-agency mortgage-backed |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 4.10% |  | 4.10% |  | 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 effective yield | 3.60% |  | 3.60% |  | 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 effective yield | 3.70% |  | 3.70% |  | 2.80%
Weighted average life |  |  | 3 years 3 months 18 days |  | 3 years
Short term investments |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Weighted average effective yield | 1.80% |  | 1.80% |  | 1.40%
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 |  |
Private equity partnerships | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | $ 185,121,000 |  | $ 185,121,000 |  |
Senior secured bank loan funds |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Investment in closed end fund | 17,100,000 |  | $ 17,100,000 |  |
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 |  |
Senior secured bank loan funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | 17,057,000 |  | $ 17,057,000 |  |
Hedge funds | Fair Value Measured at Net Asset Value Per Share |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Fair Value | 11,615,000 |  | 11,615,000 |  |
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] |  |  |  |  |
Fair Value | $ 11,300,000 |  | $ 11,300,000 |  |

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