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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / bond	Dec. 31, 2015 USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets and (liabilities)	$ 2,754	$ 3,463
Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	2,776
Other assets and (liabilities)	(4,724)
Corporate | Significant Unobservable Inputs (Level 3) | Discounted Cash Flow Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	7,500
Fixed maturity investments | Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	7,500
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities, fair value	$ (1,164)
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price | $ / bond	94.39
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price | $ / bond	99.91
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price | $ / bond	97.32
Liquidity discount	1.30%
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities, fair value	$ (3,560)
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period	6 months 11 days
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period	3 years 5 days
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Weighted Average or Actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net undiscounted cash flows	$ (10,725)
Expected loss ratio	13.00%
Net acquisition expense ratio	19.00%
Contract period	2 years 2 months 28 days
Discount rate	0.90%
Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities, fair value	$ (4,724)

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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.

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Adjustment to the discount rate used to measure fair value for lack of ability to convert business interests into cash quickly.

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-Topic 820
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-Section 50
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

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