Employee Benefit Plans (Schedule Of Amounts Not Yet Reflected In Net Periodic Benefit Cost And Included In Accumulated Other Comprehensive Income (Loss), Pre-Tax Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Prior service credit (cost)	$ 2,077	$ 2,348
Accumulated loss	(33,285)	(35,602)
Accumulated other comprehensive loss	(31,208)	(33,254)
Cumulative employer contributions in excess of net periodic benefit cost	14,050	15,017
Net amount recognized as an accrued benefit liability on the December 31 balance sheet	(17,158)	(18,237)
Prior Service Cost	0	2,618
Net loss arising during period	(248)	(1,050)
Amortization or settlement recognition of net loss	2,565	2,593
Amortization of Prior Service Cost (Credit)	(271)	(271)	$ 0
Total recognized in other comprehensive income	2,046	3,890
Total expense recognized in net periodic pension cost and other comprehensive income	$ 1,059	$ 2,395