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Goodwill and other intangible assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other intangible assets
Goodwill and other intangible assets
Changes in the carrying amount of goodwill, by reportable operating segment, for the years ended December 31, 2018 and 2017 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, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Goodwill
$
485,986

 
$
84,615

 
$
225,784

 
$
250,912

 
$
290,041

 
$
138,185

 
$
4,883

 
$
128,442

 
$
1,608,848

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

 
—

 
—

 
—

 
(22,542
)
 
(332,128
)
 
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

Goodwill related to acquisitions
—

 
27,355

 
—

 
2,403

 
4,730

 
6,590

 
—

 
(413
)
 
40,665

Translation and other adjustments
—

 
(4,815
)
 
(950
)
 
—

 
(18,663
)
 
(4,243
)
 
—

 
(1,007
)
 
(29,678
)
Balance as of December 31, 2018
$
264,869

 
$
455,589

 
$
156,339

 
$
253,315

 
$
480,615

 
$
211,547

 
$
4,883

 
$
419,422

 
$
2,246,579


Intangible assets at December 31, 2018 and 2017 consisted of the following:
 
Gross Carrying Amount
 
Accumulated Amortization
 
2018
 
2017
 
2018
 
2017
 
(Dollars in thousands)
Customer relationships
$
1,030,194

 
$
1,023,837

 
$
(322,972
)
 
$
(281,263
)
In-process research and development
28,457

 
34,672

 
—

 
—

Intellectual property
1,363,516

 
1,287,487

 
(322,539
)
 
(258,580
)
Distribution rights
23,465

 
23,697

 
(17,860
)
 
(16,996
)
Trade names
565,070

 
571,510

 
(36,379
)
 
(22,069
)
Non-compete agreements
23,004

 
23,429

 
(8,904
)
 
(1,976
)
 
$
3,033,706

 
$
2,964,632

 
$
(708,654
)
 
$
(580,884
)

As of December 31, 2018, trade names having a carrying value of $233.5 million are considered indefinite-lived. Acquired IPR&D is indefinite-lived until the completion of the related development project, at which point amortization of the carrying value of the technology will commence. See Note 4 for additional details regarding intangible assets acquired during 2018.
For the year ended December 31, 2018, the Company recognized a $16.9 million pre-tax ($8.6 million after tax) impairment charge related to the abandonment of certain intellectual property intangible assets. Refer to Note 5 for additional details.
Amortization expense related to intangible assets was $149.5 million, $98.8 million, and $63.5 million for the years ended December 31, 2018, 2017 and 2016, respectively. Estimated annual amortization expense for each of the five succeeding years is as follows:
 
(Dollars in thousands)
2019
$
150,200

2020
149,500

2021
141,900

2022
136,600

2023
135,100