Retirement Plans (Schedule Of Net Periodic Benefit Cost (Credit) For Pension And Postretirement Plans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 13	$ 0	$ 25
Interest cost	1,739	1,892	3,478	3,783
Expected return on plan assets	(3,027)	(2,827)	(6,055)	(5,654)
Amortization of net actuarial (gain) loss	2,157	2,345	4,315	4,691
Net periodic benefit cost (credit)	869	1,423	1,738	2,845
Supplemental Retirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	101	115	202	230
Amortization of prior service cost (credit)	31	31	62	62
Amortization of net actuarial (gain) loss	17	(28)	35	(57)
Net periodic benefit cost (credit)	149	118	299	235
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	9	16	18
Interest cost	10	12	20	23
Amortization of prior service cost (credit)	(37)	(61)	(75)	(122)
Amortization of net actuarial (gain) loss	(19)	(22)	(38)	(43)
Net periodic benefit cost (credit)	$ (38)	$ (62)	$ (77)	$ (124)