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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Beginning balance	$ 4,328	$ 3,390	$ 969
Increases related to current year tax positions	368	143	86
Increases related to prior year tax positions	249	1,155	2,668
Decreases related to prior year tax positions		(106)	(40)
Decreases related to settlements	(605)		(66)
Decreases due to the lapsing of statutes of limitations	(467)	(254)	(227)
Increases (decreases) for foreign exchange differences	16
Ending balance	3,889	4,328	3,390
Beginning Balance	315	208	210
Accrual of interest and penalties	161	169	92
Decreases related to prior year tax positions	(74)	(62)	(94)
Ending Balance	$ 402	$ 315	$ 208

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