Pension And Postretirement Obligations (Schedule Of Amounts In Accumulated Other Comprehensive Income (Loss) To Be Recognized Over Next Fiscal Year) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Amortization of net actuarial loss	$ 792
Amortization of prior service cost (credit)	56	56	56
Postretirement Benefits [Member]
Amortization of net actuarial loss	61
Amortization of prior service cost (credit)	$ (330)	$ (330)	$ (330)