Other Comprehensive Income (Loss) (Schedule Of Tax Expense (Benefit) Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Comprehensive Income (Loss), Tax [Abstract]
Net holding gains (losses) arising during the period	$ (107,860)	$ 328,564	$ 93,837
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	35	614	(34)
Reclassification adjustments for net gains included in net income	(29,267)	(9,890)	(16,382)
Change in net unrealized gains on investments	(137,092)	319,288	77,421
Change in foreign currency translation adjustments	408	1,918	(1,619)
Change in net actuarial pension loss	(88)	(3,687)	1,015
Total	$ (136,772)	$ 317,519	$ 76,817