Goodwill and other intangible assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill, by Reporting Segment

Changes in the carrying amount of goodwill, by reportable operating segment, for the years ended December 31, 2016 and 2015 are as follows:

	Vascular North America		Anesthesia North America		Surgical North America		EMEA			Asia			OEM		All other			Total
	(Dollars in thousands)
Balance as of December 31, 2015	$	345,546	$	141,122	$	250,912	$	306,009		$	141,067		$	1,194	$	110,002		$	1,295,852
Goodwill related to acquisitions	—		—		—		—			—			3,689		—			3,689
Translation adjustment	—		131		—		(15,968		)	(2,882		)	—		(4,102		)	(22,821		)
Balance as of December 31, 2016	$	345,546	$	141,253	$	250,912	$	290,041		$	138,185		$	4,883	$	105,900		$	1,276,720

	Vascular North America			Anesthesia North America			Surgical North America		EMEA			Asia			OEM		All other			Total
	(Dollars in thousands)
Balance as of December 31, 2014
Goodwill	$	564,177		$	214,429		$	250,912	$	339,029		$	144,712		$	—	$	142,422		$	1,655,681
Accumulated impairment losses	(219,527		)	(84,531		)	—		—			—			—		(28,070		)	(332,128		)
	344,650			129,898			250,912		339,029			144,712			—		114,352			1,323,553
Goodwill related to acquisitions	896			12,398			—		1,142			4,095			1,194		—			19,725
Translation adjustment	—			(1,174		)	—		(34,162		)	(7,740		)	—		(4,350		)	(47,426		)
Balance as of December 31, 2015	$	345,546		$	141,122		$	250,912	$	306,009		$	141,067		$	1,194	$	110,002		$	1,295,852

Components of Intangible Assets

Intangible assets at December 31, 2016 and 2015 consisted of the following:

	Gross Carrying Amount				Accumulated Amortization
	2016		2015		2016			2015
	(Dollars in thousands)
Customer lists	$	622,428	$	621,078	$	(239,055	)	$	(214,924	)
In-process research and development	16,532		58,908		—			—
Intellectual property	519,962		522,374		(203,390		)	(173,903		)
Distribution rights	23,021		23,279		(15,239		)	(14,393		)
Trade names	379,724		384,821		(13,974		)	(8,929		)
Noncompete agreements	2,692		2,186		(1,038		)	(522		)
	$	1,564,359	$	1,612,646	$	(472,696	)	$	(412,671	)

Estimated Annual Amortization Expense

Amortization expense related to intangible assets was $63.5 million, $62.4 million, and $60.9 million for the years ended December 31, 2016, 2015 and 2014, respectively. Estimated annual amortization expense for each of the five succeeding years is as follows:

	(Dollars in thousands)
2017	$	62,900
2018	62,500
2019	62,200
2020	61,800
2021	61,400