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Restructuring and other impairment charges - by segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 60,120 | $ 14,790 | $ 15,871
Vascular North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 556 | 2,595 | 5,843
Interventional North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 900 | 4,908 | 459
Anesthesia North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 371 | 1,262 | 1,839
Surgical North America |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 0 | 0 | 151
EMEA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 55,608 | 5,722 | 4,423
OEM |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | 0 | 0 | 795
All other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 2,685 | $ 303 | $ 2,361

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