Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (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
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (3)	$ 22	$ 22	$ 73
Interest cost	1,885	1,815	5,669	6,068
Expected return on plan assets	(2,827)	(2,710)	(8,481)	(9,058)
Amortization of net actuarial (gain) loss	2,198	1,152	6,889	3,851
Net periodic benefit cost (credit)	1,253	279	4,099	934
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	115	140	345	418
Amortization of prior service cost (credit)	31	31	93	94
Amortization of net actuarial (gain) loss	(28)	(4)	(85)	(12)
Net periodic benefit cost (credit)	118	167	353	500
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	8	27	24
Interest cost	12	13	35	41
Amortization of prior service cost (credit)	(61)	(61)	(183)	(183)
Amortization of net actuarial (gain) loss	(22)	(31)	(65)	(94)
Net periodic benefit cost (credit)	$ (62)	$ (71)	$ (186)	$ (212)