Pension And Other Liabilities (Schedule Of Reconciliation Of The Lease Make-Good Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Pension And Other Liabilities [Abstract]
Lease make-good provision, Beginning balance	$ 5,228	$ 4,385
Liabilities incurred during the year	35	1,314
Liabilities settled during the year	(365)	(381)
Accretion expense	262	212
Effect of changes in foreign currency	(14)	(302)
Lease make-good provision, Ending balance	$ 5,146	$ 5,228