Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1,755	1,869	5,320	5,608
Expected return on plan assets	(3,090)	(3,326)	(9,270)	(9,979)
Amortization of net actuarial (gain) loss	1,297	735	4,445	2,206
Net periodic benefit cost (credit)	(38)	(722)	495	(2,165)
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	101	113	302	340
Amortization of prior service cost (credit)	0	13	0	38
Amortization of net actuarial (gain) loss	31	5	92	14
Net periodic benefit cost (credit)	132	131	394	392
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	8	25	23
Interest cost	10	12	30	35
Amortization of prior service cost (credit)	0	0	0	0
Amortization of net actuarial (gain) loss	(13)	(18)	(40)	(53)
Net periodic benefit cost (credit)	$ 5	$ 2	$ 15	$ 5