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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) $ / bond	Dec. 31, 2014 USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Other assets (liabilities)	$ 3,463	$ 3,463	$ 5,664
Significant Unobservable Inputs (Level 3)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	242,087	242,087
Other assets (liabilities)	(5,899)	(5,899)
Significant Unobservable Inputs (Level 3) | Corporate | Discounted Cash Flow Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	7,618	$ 7,618
Significant Unobservable Inputs (Level 3) | Corporate | Discounted Cash Flow Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Credit spread		2.90%
Liquidity discount		1.00%
Risk-free rate		0.50%
Dividend rate		6.70%
Significant Unobservable Inputs (Level 3) | Fixed maturity investments
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	7,618	$ 7,618
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	$ 214,848	214,848
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	(24.60%)
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	39.00%
Significant Unobservable Inputs (Level 3) | Private equity partnerships | Net Asset Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	0.50%
Significant Unobservable Inputs (Level 3) | Senior secured bank loan fund | Net Asset Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	$ 23,231	23,231
Significant Unobservable Inputs (Level 3) | Senior secured bank loan fund | Net Asset Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	0.90%
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	$ 2,289	2,289
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	0.00%
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	0.00%
Significant Unobservable Inputs (Level 3) | Hedge funds | Net Asset Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Estimated performance	0.00%
Significant Unobservable Inputs (Level 3) | Other investments
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	$ 240,368	240,368
Significant Unobservable Inputs (Level 3) | Assumed and ceded reinsurance contracts | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assets, fair value	(5,899)	$ (5,899)
Significant Unobservable Inputs (Level 3) | Assumed and ceded reinsurance contracts | Internal Valuation Model Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period		6 months 10 days
Significant Unobservable Inputs (Level 3) | Assumed and ceded reinsurance contracts | Internal Valuation Model Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Contract period		3 years 3 days
Significant Unobservable Inputs (Level 3) | Assumed and ceded reinsurance contracts | Internal Valuation Model Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Net undiscounted cash flows		$ (10,228)
Contract period		2 years 3 months 3 days
Discount rate		1.30%
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Three [Member] | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities, fair value	(4,629)	$ (4,629)
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Three [Member] | Internal Valuation Model Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Expected loss ratio		18.00%
Net acquisition expense ratio		17.00%
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Two [Member] | Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities, fair value	$ (1,270)	$ (1,270)
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Two [Member] | Internal Valuation Model Valuation Technique | Low
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price | $ / bond		93.24
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Two [Member] | Internal Valuation Model Valuation Technique | Maximum
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Bond price | $ / bond		99.86
Significant Unobservable Inputs (Level 3) | Assumed and Ceded Re Insurance Contracts, Group Two [Member] | Internal Valuation Model Valuation Technique | Weighted average or actual
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liquidity discount		1.30%
Bond price | $ / bond		96.63

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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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-Name Accounting Standards Codification
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-Section 50
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