Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ (486)	$ (911)	$ (6,627)	$ (14,522)
Gains (losses) from fair value adjustments	33,729	(23,036)	222,296	(54,181)
Total net realized capital gains (losses)	95,943	(179,036)	354,673	(206,744)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	(486)	(911)	(6,627)	(14,522)
Gains (losses) from sales	85	2,699	4,018	(15,589)
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	512	(16)	5,539	(966)
Gains (losses) from fair value adjustments	298	(5,014)	1,623	(8,537)
Equity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales				37
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	3,154	637	23,101	2,303
Gains (losses) from fair value adjustments	58,667	(153,395)	104,739	(115,288)
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ (16)		$ (16)	$ (1)

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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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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