Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ (16,238)	$ (389)	$ (42,256)	$ (389)
Total net realized capital gains (losses)	(24,178)	59,016	(34,683)	80,142
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	(16,238)	(389)	(42,256)	(389)
Gains (losses) from sales	(2,570)	(1,695)	(10,594)	(3,643)
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	14		42	940
Gains (losses) from fair value adjustments	(6)		56
Equity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(901)	(566)	(882)	(1,054)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	755	1,365	605	(50)
Gains (losses) from fair value adjustments	$ (5,232)	60,305	$ 18,346	84,340
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales		$ (4)		$ (2)

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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