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Goodwill and other intangible assets | 12 Months Ended
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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 |

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