Segment And Geographic Information (Schedule Of Geographic Allocation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 105,576	$ 96,586	$ 208,803	$ 182,856
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	31,468	30,076	60,953	53,544
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,827	11,213	27,875	22,317
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,881	9,223	17,814	18,140
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,684	6,813	20,554	13,220
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,316	5,422	20,350	10,738
Other Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,667	17,746	29,975	33,780
Other Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	15,324	13,674	30,523	26,158
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 409	$ 2,419	$ 759	$ 4,959