Pension And Other Liabilities (Schedule Of Reconciliation Of The Lease Make-Good Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension And Other Liabilities [Abstract]
Lease make-good provision, Beginning balance	$ 5,614	$ 5,648
Liabilities incurred during the year	902
Liabilities settled during the year	(206)
Accretion expense	352	292
Effect of changes in foreign currency	5	(326)
Lease make-good provision, Ending balance	$ 6,667	$ 5,614