Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Revenue, Major Customer [Line Items]
Net revenues	$ 613,584	$ 587,230
Vascular access
Revenue, Major Customer [Line Items]
Net revenues	143,897	144,028
Anesthesia
Revenue, Major Customer [Line Items]
Net revenues	80,252	84,922
Interventional
Revenue, Major Customer [Line Items]
Net revenues	103,184	90,142
Surgical
Revenue, Major Customer [Line Items]
Net revenues	86,719	85,621
Interventional urology
Revenue, Major Customer [Line Items]
Net revenues	59,731	42,300
OEM
Revenue, Major Customer [Line Items]
Net revenues	54,238	45,854
Other (1)
Revenue, Major Customer [Line Items]
Net revenues	$ 85,563	$ 94,363