Pension And Other Liabilities (Schedule Of Reconciliation Of The Lease Make-Good Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension And Other Liabilities [Abstract]
Lease make-good provision, Beginning balance	$ 5,146	$ 5,228
Liabilities incurred during the year		35
Liabilities settled during the year		(365)
Accretion expense	282	262
Effect of changes in foreign currency	220	(14)
Lease make-good provision, Ending balance	$ 5,648	$ 5,146