Pension And Other Liabilities (Schedule Of Reconciliation Of The Lease Make-Good Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension And Other Liabilities [Abstract]
Lease make-good provision, Beginning balance	$ 6,667	$ 5,614
Liabilities incurred during the year	62	902
Liabilities settled during the year		(206)
Accretion expense	291	352
Effect of changes in foreign currency	388	5
Lease make-good provision, Ending balance	$ 7,408	$ 6,667