Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Composition of Goodwill and Changes

Composition of goodwill and changes therein the years ended December 31, 2017 and 2016 are as follows:

	December 31
	2017		2016
	$ in thousands
Balance at the beginning of year		176,374		170,177
Acquired during the year		1,112		6,197
Balance at the end of year		177,486		176,374

Summary of Other Intangible Assets

Other intangible assets are composed as follows:

	December 31
	2017		2016
	$ in thousands
Cost:
Intellectual property		67,650		67,350
Customer relations		97,483		97,483
Trade name		6,008		6,008
IPR&D		8,800
Other		143		143
		180,084		170,984
Less: accumulated amortization		111,858		86,774
		68,226		84,210

Estimated Amortization Expense

Estimated amortization expense for the years stated below is as follows:

	$ in thousands
Year ending December 31:
2018		25,531
2019		18,657
2020		10,301
2021		3,718
2022		1,004
2023 and thereafter		215
		59,426