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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified						9 Months Ended			3 Months Ended				3 Months Ended		3 Months Ended					9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Significant Unobservable Inputs (Level 3)	Dec. 31, 2013 Significant Unobservable Inputs (Level 3)	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique Weighted Average or Actual	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Fixed maturity investments	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Low	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Maximum	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Weighted Average or Actual	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique Weighted Average or Actual	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Low	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Maximum	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Weighted Average or Actual	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Other Investments	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Low D	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Maximum D	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Weighted Average or Actual D	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Weather Contract Internal Valuation Model Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique	Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique	Sep. 30, 2014 Call Rights Significant Unobservable Inputs (Level 3) Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Credit spread						0.00%
Liquidity discount						1.00%
Risk-free rate						0.40%
Dividend rate						6.20%
Estimated performance									(13.90%)	8.30%	(0.40%)		0.50%		0.00%	0.00%	0.00%
Net undiscounted cash flows																				$ 140	$ 6,284	$ 3,784
Contract period																				824	1,100	857
Discount rate																						0.80%
Assets, fair value			330,906		15,936		15,936	300,800				18,723		2,718				322,241						300,800	18,723	2,718	264
Liabilities, fair value																			(7,281)				(254)
Other assets and (liabilities)	$ (17,272)	$ (8,233)	$ (7,271)	$ (2,490)															$ (7,281)

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Fair Value Inputs, Contract Period

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Estimated percentage return for the period on fair value at beginning of period.

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Net Undiscounted Cash Flows

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Total Other Assets And liabilities Measured on Recurring Basis

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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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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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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

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Risk-free interest rate assumption used in valuing an instrument.

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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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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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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

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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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