Goodwill and other intangible assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill, by Reporting Segment

Changes in the carrying amount of goodwill, by reporting segment, for the years ended December 31, 2015 and 2014 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, 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

	Vascular North America			Anesthesia North America			Surgical North America		EMEA			Asia			All other			Total
	(Dollars in thousands)
Balance as of December 31, 2013
Goodwill	$	564,089		$	214,898		$	250,506	$	373,417		$	136,946		$	146,475		1,686,331
Accumulated impairment losses	(219,527		)	(84,531		)	—		—			—			(28,070		)	(332,128		)
	344,562			130,367			250,506		373,417			136,946			118,405			1,354,203
Goodwill related to acquisitions	—			—			406		—			15,986			—			16,392
Translation adjustment	88			(469		)	—		(34,388		)	(8,220		)	(4,053		)	(47,042		)
Balance as of December 31, 2014	$	344,650		$	129,898		$	250,912	$	339,029		$	144,712		$	114,352		$	1,323,553

Components of Intangible Assets

Intangible assets at December 31, 2015 and 2014 consisted of the following:

	Gross Carrying Amount				Accumulated Amortization
	2015		2014		2015			2014
	(Dollars in thousands)
Customer lists	$	621,078	$	624,574	$	(214,924	)	$	(192,876	)
In-process research and development	58,908		68,694		—			—
Intellectual property	522,374		467,068		(173,903		)	(146,131		)
Distribution rights	23,279		16,101		(14,393		)	(14,243		)
Trade names	384,821		396,269		(8,929		)	(2,764		)
Noncompete agreements	2,186		337		(522		)	(309		)
	$	1,612,646	$	1,573,043	$	(412,671	)	$	(356,323	)

Estimated Annual Amortization Expense

Amortization expense related to intangible assets was $62.4 million, $60.9 million, and $50.6 million for the years ended December 31, 2015, 2014 and 2013, respectively. Estimated annual amortization expense for each of the five succeeding years is as follows:

	(Dollars in thousands)
2016	$	64,300
2017	64,400
2018	64,200
2019	64,000
2020	63,500