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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Total other assets and (liabilities) | $ 2,533 | $ 2,542
Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Total other assets and (liabilities) | 2,780 |
Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets | $ 893 |
Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | $ 101.46 |
Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | 112.05 |
Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | $ 107.31 |
Liquidity discount | 1.30% |
Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other (liabilities) | $ (3,673) |
Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period | 2 years |
Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period | 4 years 8 months 12 days |
Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Net undiscounted cash flows | $ (4,706) |
Expected loss ratio | 20.40% |
Net acquisition expense ratio | 13.70% |
Contract period | 4 years 1 month 6 days |
Discount rate | 2.40% |

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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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- Definition Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly. + 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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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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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- Definition Price at which a dealer is willing to buy an instrument, used as an input to measure fair value. + 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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