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Income Taxes (Schedule Of Uncertain Tax Position Liability And Liability For Interest And Penalties On Uncertain Tax Positions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Beginning balance	$ 3,889	$ 4,328	$ 3,390
Increases related to current year tax positions	691	368	143
Decreases due to the lapsing of statutes of limitations	(880)	(467)	(254)
Decreases related to prior year tax positions	(154)		(106)
(Decreases) increases for foreign exchange differences	(22)
(Decreases) increases for foreign exchange differences		16
(Decreases) Increases related to prior year tax positions		249	1,155
(Decreases) increases related to prior year tax positions	(1)
Decreases related to settlements		(605)
Ending balance	3,523	3,889	4,328
Beginning Balance	402	315	208
Accrual of interest and penalties	227	161	169
Decreases related to prior year tax positions	(195)	(74)	(62)
Ending Balance	$ 434	$ 402	$ 315

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