Other Comprehensive Income (Loss) (Summary Of Tax Expense (Benefit) Of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss), Tax [Abstract]
Net holding gains (losses) arising during the period	$ 71,381	$ (113,579)	$ 187,880	$ (57,997)
Change in unrealized other-than-temporary impairment losses on fixed maturities arising during the period	9	(3)	(6)	38
Reclassification adjustments for net gains included in net income	(2,333)	(2,576)	(7,810)	(5,672)
Change in net unrealized gains on investments	69,057	(116,158)	180,064	(63,631)
Change in foreign currency translation adjustments	(1,618)	1,872	(1,695)	833
Change in net actuarial pension loss	86	117	188	233
Total	$ 67,525	$ (114,169)	$ 178,557	$ (62,565)