Segment And Geographic Information (Schedule Of Geographic Allocation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 95,374	$ 81,506
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	32,572	30,510
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	11,104	5,492
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,917	8,424
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	6,407	3,768
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,316	4,312
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	16,034	15,779
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	12,483	9,813
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 2,541	$ 3,408