Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory

	December 31
	2017		2016
	$ in thousands
Components:
For manufacturing of systems		71,017		52,246
For service of systems		44,534		37,545
		115,551		89,791
Work in process		25,539		14,914
Finished products		41,062		27,730
Total		182,152		132,435