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Goodwill and other intangible assets (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 are as follows:

 
Vascular North America
 
Interventional North America
 
Anesthesia North America
 
Surgical North America
 
EMEA
 
Asia
 
OEM
 
All other
 
Total
 
(Dollars in thousands)
Balance as of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
$
485,986

 
$
84,615

 
$
225,653

 
$
250,912

 
$
306,009

 
$
141,067

 
$
1,194

 
$
132,544

 
$
1,627,980

Accumulated impairment losses
(219,527
)
 
(5,528
)
 
(84,531
)
 
—

 
—

 
—

 
—

 
(22,542
)
 
(332,128
)
 
266,459

 
79,087

 
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
$
266,459

 
$
79,087

 
$
141,253

 
$
250,912

 
$
290,041

 
$
138,185

 
$
4,883

 
$
105,900

 
$
1,276,720

Goodwill related to acquisitions
—

 
342,901

 
15,599

 
—

 
161,543

 
59,954

 
—

 
313,714

 
893,711

Translation and other adjustments
(1,590
)
 
11,061

 
437

 
—

 
42,964

 
11,061

 
—

 
1,228

 
65,161

Balance as of December 31, 2017
$
264,869

 
$
433,049

 
$
157,289

 
$
250,912

 
$
494,548

 
$
209,200

 
$
4,883

 
$
420,842

 
$
2,235,592
Components of Intangible Assets
Intangible assets at December 31, 2017 and 2016 consisted of the following:
 
Gross Carrying Amount
 
Accumulated Amortization
 
2017
 
2016
 
2017
 
2016
 
(Dollars in thousands)
Customer relationships
$
1,023,837

 
$
622,428

 
$
(281,263
)
 
$
(239,055
)
In-process research and development
34,672

 
16,532

 
—

 
—

Intellectual property
1,287,487

 
519,962

 
(258,580
)
 
(203,390
)
Distribution rights
23,697

 
23,021

 
(16,996
)
 
(15,239
)
Trade names
571,510

 
379,724

 
(22,069
)
 
(13,974
)
Non-compete agreements
23,429

 
2,692

 
(1,976
)
 
(1,038
)
 
$
2,964,632

 
$
1,564,359

 
$
(580,884
)
 
$
(472,696
)
Estimated Annual Amortization Expense
Amortization expense related to intangible assets was $98.8 million, $63.5 million, and $62.4 million for the years ended December 31, 2017, 2016 and 2015, respectively. Estimated annual amortization expense for each of the five succeeding years is as follows:
 
(Dollars in thousands)
2018
$
145,300

2019
144,400

2020
143,600

2021
142,800

2022
140,900