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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Total other assets and (liabilities) | $ 2,542 | $ 4,379
Significant Unobservable Inputs (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Total other assets and (liabilities) | (2,952) |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets and (liabilities) | $ 850 |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) | $ 101.53 |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Maximum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) | 111.56 |
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Weighted average or actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) | $ 107.15 |
Liquidity discount | 1.30% |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assumed and ceded (re)insurance contracts | $ 3,802 |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period | 2 years |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Maximum |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period | 4 years 8 months 12 days |
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Weighted average or actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Net undiscounted cash flows | $ (4,626) |
Expected loss ratio | 22.10% |
Net acquisition expense ratio | 13.50% |
Contract period | 4 years 1 month 6 days |
Discount rate | 2.20% |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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