Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments		$ (191)
Total net realized capital gains (losses)	21,126	126,735
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments		(191)
Gains (losses) from sales	(1,948)	4,877
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	940	(58)
Gains (losses) from fair value adjustments		84
Equity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(488)	233
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,415)	8,019
Gains (losses) from fair value adjustments	24,035	113,757
Short-Term Investments And Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ 2	$ 14

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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