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Investments (Summary Of Activity For Credit Losses Recognized ) (Details) (USD $)
In Thousands
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Investments [Abstract]    
Cumulative credit loss, beginning balance$ 15,167$ 10,307$ 10,307$ 9,141
Other-than-temporary impairment losses not previously recognized87508750
Increases related to other-than-temporary impairment losses previously recognized59805,4731,185
Total additions1,47306,3481,185
Sales of fixed maturities on which credit losses were recognized00(15)(19)
Cumulative credit loss, ending balance$ 16,640$ 10,307$ 16,640$ 10,307