Employee Benefit Plans (Schedule Of Amounts Recognized In Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent liabilities - pension and postretirement obligations	$ (19,475)	$ (13,588)	$ (13,331)	$ (13,308)	$ (13,047)	$ (17,655)	$ (17,821)	$ (17,690)	$ (17,586)
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities - accrued pension and postretirement costs	(391)				(380)
Noncurrent liabilities - pension and postretirement obligations	(13,800)				(8,373)
Net amount recognized	(14,191)				(8,753)
Net loss (gain)	12,120				6,466
Net amount recognized in accumulated other comprehensive income (loss)	12,120				6,466
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Current liabilities - accrued pension and postretirement costs	(67)				(64)
Noncurrent liabilities - pension and postretirement obligations	(1,232)				(1,016)
Net amount recognized	(1,299)				(1,080)
Net loss (gain)	(30)				(192)
Net amount recognized in accumulated other comprehensive income (loss)	$ (30)				$ (192)