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Investments (Summary Of Activity For Credit Losses Recognized ) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Cumulative credit loss recognized in income	$ 21,370	$ 10,307
Changes in cumulative credit losses	$ 0	$ 0

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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