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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - Internal Valuation Model - Significant Unobservable Inputs (Level 3) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Jun. 30, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets and (liabilities) |  | $ (9,502)
Assumed reinsurance contract |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Assets, fair value |  | $ 809
Assumed reinsurance contract | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | $ 101.59 |
Assumed reinsurance contract | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | 111.15 |
Assumed reinsurance contract | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Bond price (in dollars per share) | $ 106.94 |
Liquidity discount |  | 1.30%
Assumed and ceded (re)insurance contract |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets and (liabilities) |  | $ (10,311)
Assumed and ceded (re)insurance contract | Low |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period |  | 2 years
Assumed and ceded (re)insurance contract | High |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Contract period |  | 4 years 7 months 27 days
Assumed and ceded (re)insurance contract | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Net undiscounted cash flows |  | $ (12,715)
Expected loss ratio |  | 30.60%
Net acquisition expense ratio |  | (17.40%)
Contract period |  | 4 years 6 months
Discount rate |  | 1.90%

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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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