Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (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
Credit losses recognized in earnings on fixed maturity securities
Credit Losses Recognized In Earnings, BOP	$ 3,387	$ 11,201	$ 3,542	$ 14,148
Credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period	(59)	(8,206)	(190)	(11,420)
Additional credit loss impairments recognized in the current period on securities previously impaired	71	558	223	857
Increases due to the passage of time on previously recorded credit losses	28	55	79	317
Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected	(114)	(76)	(341)	(370)
Credit Losses Recognized In Earnings, EOP	$ 3,313	$ 3,532	$ 3,313	$ 3,532