Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Composition of Assets, Grouped by Major Classifications

Composition of assets, grouped by major classifications, is as follows:

	December 31
	2017		2016
	$ in thousands
Cost:
Machinery and equipment		58,555		51,968
Leasehold improvements		57,063		51,688
Land and buildings		11,668		12,153
Office furniture and equipment		14,740		15,472
Computer equipment		73,460		61,257
Vehicles		469		404
		215,955		192,942
Less - accumulated depreciation and amortization		146,343		130,567
		69,612		62,375