Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Revenue, Major Customer [Line Items]
Net revenues	$ 652,507	$ 609,866	$ 1,266,091	$ 1,197,096
Vascular access
Revenue, Major Customer [Line Items]
Net revenues	153,647	140,149	297,544	284,177
Anesthesia
Revenue, Major Customer [Line Items]
Net revenues	85,723	89,311	165,975	174,233
Interventional
Revenue, Major Customer [Line Items]
Net revenues	104,785	98,189	207,969	188,331
Surgical
Revenue, Major Customer [Line Items]
Net revenues	95,570	90,517	182,289	176,138
Interventional urology
Revenue, Major Customer [Line Items]
Net revenues	67,952	47,674	127,683	89,974
OEM
Revenue, Major Customer [Line Items]
Net revenues	56,428	52,594	110,666	98,448
Other
Revenue, Major Customer [Line Items]
Net revenues	$ 88,402	$ 91,432	$ 173,965	$ 185,795